Update CONTRIBUTING.md

Author: evertramos

.github/CONTRIBUTING.md

@@ -1,9 +1,16 @@
-### Contributions
+## Contributions
 
-All contributions regarding the `nginx.tmpl` should be suggested or implemented in the [nginx-proxy repository](https://raw.githubusercontent.com/jwilder/nginx-proxy).
+### nginx.tmpl file
+
+All contributions regarding the `nginx.tmpl` should be suggested or implemented in the [nginx-proxy repository](https://github.com/nginx-proxy/nginx-proxy).
 
 We always use the latest version of this file:
 
 [https://raw.githubusercontent.com/jwilder/nginx-proxy/master/nginx.tmpl](https://raw.githubusercontent.com/jwilder/nginx-proxy/master/nginx.tmpl)
 
+### Pull requests
+
+Sometimes it's better to start a discussion or an issue to find out the best solution of suggestion before sending a pull request... and if you do so, please test it with the automation script before sending new code.
+
+
 Thanks!