add prometheus_cowboy & prometheus_httpd to deps

deadtrickster · web-flow · commit cb79014cc2cd · 2018-09-16T12:25:12.000+03:00
see rabbitmq/rabbitmq-website#583
diff --git a/src/prometheus_rabbitmq_exporter.app.src b/src/prometheus_rabbitmq_exporter.app.src
@@ -8,7 +8,9 @@
                   stdlib,
                   rabbit,
                   rabbitmq_management,
-                  prometheus]},
+                  prometheus,
+                  prometheus_cowboy,
+                  prometheus_httpd]},
 
   {maintainers, ["Ilya Khaprov"]},
   {licenses, ["MIT"]},
