update contributing doc

.github/CONTRIBUTING.md

@@ -4,15 +4,15 @@
 ## Issues
 
 Found a bug? Got a question? Want some enhancement?<br>
-First place to go is the repository issues section and I'll try to help as much as possible.
+First place to go is the repository issues section, and I'll try to help as much as possible.
 
 ## Pull Requests
 
 Fixed a bug or just want to provided additional functionality?<br>
 Simply fork this repository, implement your changes and create a pull request.<br>
 Few guidelines regarding pull requests:
 
-* This repository is integrated with travis.ci for continues integration.<br>
+* This repository is integrated with travis.ci for continuous integration.<br>
 
 Your pull request build must pass (the build will run automatically).<br>
 You can run the following command locally to ensure the build will pass:
@@ -27,4 +27,4 @@ npm run build
 npm run lint
 ````
 
-* There are many automatic unit tests as part of the library which provide full coverage of the functionality.<br>Any fix/enhancement must come with a set of tests to ensure its working well.
+* There are many automatic unit tests as part of the library which provide full coverage of the functionality.<br>Any fix/enhancement must come with a set of tests to ensure it's working well.