Clarify CONTRIBUTING

Author: kemitchell

CONTRIBUTING.md

@@ -5,8 +5,8 @@ Please:
 1. Use [JavaScript Standard Style](https://www.npmjs.com/packages/standard).
 
 2. Add tests to the code blocks in `README.md`, using Node.js' built-in
-   `assert` module. Those examples are run as the test suite.
+   `assert` module. Travis CI runs those examples as a test suite.
 
 3. Add yourself to `AUTHORS`.
 
-4. License your contributions under the existing, MIT-style license.
+4. License your contributions under the existing, MIT-style terms.