Fix typo

Fix typo in PR template.

Author: martincostello

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,5 @@
 _Summarize the changes this Pull Request makes._
 
-_If adding a new provider, please ensure you have included appropiate test(s)._
+_If adding a new provider, please ensure you have included appropriate test(s)._
 
 _Please include a reference to a GitHub issue if appropriate._