Fixing formatting issue in "Using the issue queue"

Also added line about squashing commits to the PR section.

README.md

@@ -29,6 +29,7 @@ For general C3.js-related discussion, please visit our [Google Group at https://
 The [issue queue](https://github.com/masayuki0812/c3/issues) is to be used for reporting defects and problems with C3.js, in addition to feature requests and ideas. It is **not** a catch-all support forum. **For general support enquiries, please use the [Google Group](https://groups.google.com/forum/#!forum/c3js) at https://groups.google.com/forum/#!forum/c3js.** All questions involving the interplay between C3.js and any other library (such as AngularJS) should be posted there first!
 
 Before reporting an issue, please do the following:
+
 1. [Search for existing issues](https://github.com/masayuki0812/c3/issues) to ensure you're not posting a duplicate.
 
 1.  [Search the Google Group](https://groups.google.com/forum/#!forum/c3js) to ensure it hasn't been addressed there already.
@@ -39,7 +40,7 @@ Before reporting an issue, please do the following:
 
 ## Pull requests
 Pull requests are welcome, though please post an issue first to see whether such a change is desirable.
-If you choose to submit a pull request, please do not bump the version number unless asked to, and please include test cases for any new features!
+If you choose to submit a pull request, please do not bump the version number unless asked to, and please include test cases for any new features. Squash all your commits as well, please.
 
 ## Playground
 Please fork this fiddle: