BUG: footnote

Footnote was using RST style and not markdown style

CONTRIBUTING.md

@@ -95,10 +95,10 @@ For merging, you should:
 1. Include an example for use
 2. Add a note to ``CHANGELOG.md`` about the changes
 3. Ensure that all checks passed (current checks include Scrutinizer, Travis-CI,
-   and Coveralls) [1]_
+   and Coveralls) [^1]
 
-.. [1] If you don't have all the necessary Python versions available locally or
-       have trouble building all the testing environments, you can rely on
-       Travis to run the tests for each change you add in the pull request.
-       Because testing here will delay tests by other developers, please ensure
-       that the code passes all tests on your local system first.
+[^1] If you don't have all the necessary Python versions available locally or
+    have trouble building all the testing environments, you can rely on
+    Travis to run the tests for each change you add in the pull request.
+    Because testing here will delay tests by other developers, please ensure
+    that the code passes all tests on your local system first.