Update Contributing section in README.md to run the gulp test command rather than just gulp

Author: gregjacobs

README.md

@@ -368,9 +368,15 @@ The full API docs for Autolinker may be referenced at:
 Pull requests definitely welcome.
 
 - Make sure to add tests to cover your new functionality/bugfix.
-- Run the `gulp` command to build/test (or alternatively, open the `tests/index.html` file to run the tests).
-- When committing, please omit checking in the files in the `dist/` folder after building/testing. These are only committed to the repository for users downloading Autolinker via Bower. I will build these files and assign them a version number when merging your PR.
-- Please use tabs for indents! Tabs are better for everybody (individuals can set their editors to different tab sizes based on their visual preferences).
+- Run the `gulp test` command to build/test (or alternatively, open the 
+  `tests/index.html` file to run the tests).
+- When committing, please omit checking in the files in the `dist/` 
+  folder after building/testing. These are only committed to the 
+  repository for users downloading Autolinker via Bower. I will build 
+  these files and assign them a version number when merging your PR.
+- Please use tabs for indents! Tabs are better for everybody 
+  (individuals can set their editors to different tab sizes based on 
+  their visual preferences).
 
 
 ## Changelog