Update Rate Limits on catch (#85, thanks to @cedricdelpoux)

Before metrics could be off for failed requests when using promise flow

lib/httpClient.js

@@ -189,6 +189,13 @@ HttpClient.prototype._requestHelper = function (options, done) {
       limits = rateLimiting.updateRateLimits(response.headers)
       return Promise.resolve(response.body)
     })
+    .catch((e) => {
+      if (e.response && e.response.headers) {
+        limits = rateLimiting.updateRateLimits(e.response.headers)
+      }
+
+      return Promise.reject(e)
+    })
     .asCallback(callback)
 }