docs(CONTRIBUTING): corrected a small grammar issue and changed a line (#911)

Author: NilmaPeiris

CONTRIBUTING.md

@@ -86,8 +86,8 @@ into the project.
 
 ### For new Contributors
 
-If you never created a pull request before, welcome :tada: :smile: [Here is a great tutorial](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github)
-on how to send one :)
+If you have never created a pull request before, welcome :tada: :smile: [Here is a great tutorial](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github)
+on how to create a pull request..
 
 1. [Fork](http://help.github.com/fork-a-repo/) the project, clone your fork,
    and configure the remotes: