Merge branch '69-go15-compat' into 'master'

Resolve "http.StatusTooManyRequests breaks Go 1.5 compatibility"

This merge request replaces a constant introduced in go1.6 with its literal value, as we need go1.5 support. No other changes are required.

It also modifies .gitlab-ci.yml to test against go1.5, 1.6 and 1.7, to prevent future regressions.

Closes #69

See merge request !73

.gitlab-ci.yml

-image: golang:1.6.2
+.test_template: &test_definition
+  script:
+  - apt-get update -qq && apt-get install -y unzip bzip2
+  - make test
 
-test:
-  script: 
-    - apt-get update -qq && apt-get install -y unzip bzip2
-    - make test
+test:go1.5.4:
+  <<: *test_definition
+  image: golang:1.5.4
 
+test:go1.6.3:
+  <<: *test_definition
+  image: golang:1.6.3
+
+test:go1.7.1:
+  <<: *test_definition
+  image: golang:1.7.1

internal/helper/helpers.go

@@ -28,7 +28,7 @@ func ServiceUnavailable(w http.ResponseWriter, r *http.Request, err error) {
 }
 
 func TooManyRequests(w http.ResponseWriter, r *http.Request, err error) {
-	http.Error(w, "Too Many Requests", http.StatusTooManyRequests)
+	http.Error(w, "Too Many Requests", 429) // http.StatusTooManyRequests was added in go1.6
 	captureRavenError(r, err)
 	printError(r, err)
 }