Moved from Dep to Go Modules

We have finally dropped go dep and moved over to go mod !

During the move, some dependencies have been bumped.

vendor/github.com/google/go-github/github/github.go

@@ -27,10 +27,9 @@ import (
 )
 
 const (
-	libraryVersion = "15"
 	defaultBaseURL = "https://api.github.com/"
 	uploadBaseURL  = "https://uploads.github.com/"
-	userAgent      = "go-github/" + libraryVersion
+	userAgent      = "go-github"
 
 	headerRateLimit     = "X-RateLimit-Limit"
 	headerRateRemaining = "X-RateLimit-Remaining"
@@ -46,15 +45,9 @@ const (
 
 	// Media Type values to access preview APIs
 
-	// https://developer.github.com/changes/2015-03-09-licenses-api/
-	mediaTypeLicensesPreview = "application/vnd.github.drax-preview+json"
-
 	// https://developer.github.com/changes/2014-12-09-new-attributes-for-stars-api/
 	mediaTypeStarringPreview = "application/vnd.github.v3.star+json"
 
-	// https://developer.github.com/changes/2015-11-11-protected-branches-api/
-	mediaTypeProtectedBranchesPreview = "application/vnd.github.loki-preview+json"
-
 	// https://help.github.com/enterprise/2.4/admin/guides/migrations/exporting-the-github-com-organization-s-repositories/
 	mediaTypeMigrationsPreview = "application/vnd.github.wyandotte-preview+json"
 
@@ -100,20 +93,35 @@ const (
 	// https://developer.github.com/changes/2017-07-17-update-topics-on-repositories/
 	mediaTypeTopicsPreview = "application/vnd.github.mercy-preview+json"
 
-	// https://developer.github.com/changes/2017-07-26-team-review-request-thor-preview/
-	mediaTypeTeamReviewPreview = "application/vnd.github.thor-preview+json"
-
-	// https://developer.github.com/v3/apps/marketplace/
-	mediaTypeMarketplacePreview = "application/vnd.github.valkyrie-preview+json"
-
 	// https://developer.github.com/changes/2017-08-30-preview-nested-teams/
 	mediaTypeNestedTeamsPreview = "application/vnd.github.hellcat-preview+json"
 
 	// https://developer.github.com/changes/2017-11-09-repository-transfer-api-preview/
 	mediaTypeRepositoryTransferPreview = "application/vnd.github.nightshade-preview+json"
 
-	// https://developer.github.com/changes/2017-12-19-graphql-node-id/
-	mediaTypeGraphQLNodeIDPreview = "application/vnd.github.jean-grey-preview+json"
+	// https://developer.github.com/changes/2018-01-25-organization-invitation-api-preview/
+	mediaTypeOrganizationInvitationPreview = "application/vnd.github.dazzler-preview+json"
+
+	// https://developer.github.com/changes/2018-03-16-protected-branches-required-approving-reviews/
+	mediaTypeRequiredApprovingReviewsPreview = "application/vnd.github.luke-cage-preview+json"
+
+	// https://developer.github.com/changes/2018-02-22-label-description-search-preview/
+	mediaTypeLabelDescriptionSearchPreview = "application/vnd.github.symmetra-preview+json"
+
+	// https://developer.github.com/changes/2018-02-07-team-discussions-api/
+	mediaTypeTeamDiscussionsPreview = "application/vnd.github.echo-preview+json"
+
+	// https://developer.github.com/changes/2018-03-21-hovercard-api-preview/
+	mediaTypeHovercardPreview = "application/vnd.github.hagar-preview+json"
+
+	// https://developer.github.com/changes/2018-01-10-lock-reason-api-preview/
+	mediaTypeLockReasonPreview = "application/vnd.github.sailor-v-preview+json"
+
+	// https://developer.github.com/changes/2018-05-07-new-checks-api-public-beta/
+	mediaTypeCheckRunsPreview = "application/vnd.github.antiope-preview+json"
+
+	// https://developer.github.com/enterprise/2.13/v3/repos/pre_receive_hooks/
+	mediaTypePreReceiveHooksPreview = "application/vnd.github.eye-scream-preview"
 )
 
 // A Client manages communication with the GitHub API.
@@ -142,6 +150,7 @@ type Client struct {
 	Admin          *AdminService
 	Apps           *AppsService
 	Authorizations *AuthorizationsService
+	Checks         *ChecksService
 	Gists          *GistsService
 	Git            *GitService
 	Gitignores     *GitignoresService
@@ -155,6 +164,7 @@ type Client struct {
 	Reactions      *ReactionsService
 	Repositories   *RepositoriesService
 	Search         *SearchService
+	Teams          *TeamsService
 	Users          *UsersService
 }
 
@@ -232,6 +242,7 @@ func NewClient(httpClient *http.Client) *Client {
 	c.Admin = (*AdminService)(&c.common)
 	c.Apps = (*AppsService)(&c.common)
 	c.Authorizations = (*AuthorizationsService)(&c.common)
+	c.Checks = (*ChecksService)(&c.common)
 	c.Gists = (*GistsService)(&c.common)
 	c.Git = (*GitService)(&c.common)
 	c.Gitignores = (*GitignoresService)(&c.common)
@@ -245,6 +256,7 @@ func NewClient(httpClient *http.Client) *Client {
 	c.Reactions = (*ReactionsService)(&c.common)
 	c.Repositories = (*RepositoriesService)(&c.common)
 	c.Search = (*SearchService)(&c.common)
+	c.Teams = (*TeamsService)(&c.common)
 	c.Users = (*UsersService)(&c.common)
 	return c
 }
@@ -478,12 +490,7 @@ func (c *Client) Do(ctx context.Context, req *http.Request, v interface{}) (*Res
 
 		return nil, err
 	}
-
-	defer func() {
-		// Drain up to 512 bytes and close the body to let the Transport reuse the connection
-		io.CopyN(ioutil.Discard, resp.Body, 512)
-		resp.Body.Close()
-	}()
+	defer resp.Body.Close()
 
 	response := newResponse(resp)
 
@@ -493,18 +500,25 @@ func (c *Client) Do(ctx context.Context, req *http.Request, v interface{}) (*Res
 
 	err = CheckResponse(resp)
 	if err != nil {
-		// even though there was an error, we still return the response
-		// in case the caller wants to inspect it further
-		return response, err
+		// Even though there was an error, we still return the response
+		// in case the caller wants to inspect it further.
+		// However, if the error is AcceptedError, decode it below before
+		// returning from this function and closing the response body.
+		if _, ok := err.(*AcceptedError); !ok {
+			return response, err
+		}
 	}
 
 	if v != nil {
 		if w, ok := v.(io.Writer); ok {
 			io.Copy(w, resp.Body)
 		} else {
-			err = json.NewDecoder(resp.Body).Decode(v)
-			if err == io.EOF {
-				err = nil // ignore EOF errors caused by empty response body
+			decErr := json.NewDecoder(resp.Body).Decode(v)
+			if decErr == io.EOF {
+				decErr = nil // ignore EOF errors caused by empty response body
+			}
+			if decErr != nil {
+				err = decErr
 			}
 		}
 	}
@@ -693,7 +707,7 @@ func CheckResponse(r *http.Response) error {
 			Response: errorResponse.Response,
 			Message:  errorResponse.Message,
 		}
-	case r.StatusCode == http.StatusForbidden && errorResponse.DocumentationURL == "https://developer.github.com/v3/#abuse-rate-limits":
+	case r.StatusCode == http.StatusForbidden && strings.HasSuffix(errorResponse.DocumentationURL, "/v3/#abuse-rate-limits"):
 		abuseRateLimitError := &AbuseRateLimitError{
 			Response: errorResponse.Response,
 			Message:  errorResponse.Message,