Update Go modules/vendor directory

Closes #368

vendor/github.com/microcosm-cc/bluemonday/Makefile

@@ -0,0 +1,42 @@
+# Targets:
+#
+#   all:          Builds the code locally after testing
+#
+#   fmt:          Formats the source files
+#   build:        Builds the code locally
+#   vet:          Vets the code
+#   lint:         Runs lint over the code (you do not need to fix everything)
+#   test:         Runs the tests
+#   cover:        Gives you the URL to a nice test coverage report
+#
+#   install:      Builds, tests and installs the code locally
+
+.PHONY: all fmt build vet lint test cover install
+
+# The first target is always the default action if `make` is called without
+# args we build and install into $GOPATH so that it can just be run
+
+all: fmt vet test install
+
+fmt:
+	@gofmt -s -w ./$*
+
+build:
+	@go build
+
+vet:
+	@go vet *.go
+
+lint:
+	@golint *.go
+
+test:
+	@go test -v ./...
+
+cover: COVERAGE_FILE := coverage.out
+cover:
+	@go test -coverprofile=$(COVERAGE_FILE) && \
+	cover -html=$(COVERAGE_FILE) && rm $(COVERAGE_FILE)
+
+install:
+	@go install ./...