Use tagged versions for dependencies where possible

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/emicklei/go-restful/logger.go

@@ -21,7 +21,7 @@ func TraceLogger(logger log.StdLogger) {
 	EnableTracing(logger != nil)
 }
 
-// expose the setter for the global logger on the top-level package
+// SetLogger exposes the setter for the global logger on the top-level package
 func SetLogger(customLogger log.StdLogger) {
 	log.SetLogger(customLogger)
 }