Fix a link

Author: brettcannon

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 [![Build Status (Travis)](https://travis-ci.org/Microsoft/vscode-python.svg?branch=master)](https://travis-ci.org/Microsoft/vscode-python) [![Build status (AppVeyor)](https://ci.appveyor.com/api/projects/status/s0pt8d79gqw222j7?svg=true)](https://ci.appveyor.com/project/DonJayamanne/vscode-python-v3vd6) [![codecov](https://codecov.io/gh/Microsoft/vscode-python/branch/master/graph/badge.svg)](https://codecov.io/gh/Microsoft/vscode-python)
 
 # Contributing to Microsoft Python Analysis Engine
-[Contributing to Python Analysis Engine](https://github.com/Microsoft/vscode-python/blob/master/CONTRIBUTING - PYTHON_ANALYSIS.md)
+[Contributing to Python Analysis Engine](https://github.com/Microsoft/vscode-python/blob/master/CONTRIBUTING%20-%20PYTHON_ANALYSIS.md)
 
 ## Contributing a pull request