README: fix typo

README.md

@@ -6,7 +6,7 @@ It has been developed by Stanford Research Computing for our HPC cluster account
 Python 2.6 or 2.7 are fully supported.
 
 # Third Party Libraries and Dependencies
-The following library are required:
+The following library is required:
 * [requests](http://docs.python-requests.org/)
 
 # Author