docs(readme): change wording

MarkPieszak · web-flow · commit cf0eaa0e0db0 · 2018-06-13T13:28:51.000-04:00
diff --git a/README.md b/README.md
@@ -128,7 +128,7 @@ AppInsightsService.clearAuthenticatedUserContext()
 
 ---
 
-# Want to Contribute
+# How to Contribute?
 
 ## ng-Application-Insights Development
 
