Fix typo

Co-Authored-By: Tim Head <betatim@gmail.com>

tests/pipfile/py2-with-server-and-kernel-req/README.rst

@@ -2,6 +2,6 @@ Python 2 - Pipfile and requirements3.txt
 ----------------------------------------
 
 - We should get Python 2 setup for the Kernel
-   - with 'numpy' installed installed through Pipfile as listed in 'packages'
+   - with 'numpy' installed through Pipfile as listed in 'packages'
    - with 'parse' installed installed through Pipfile as listed in 'dev-packages'
 - We should get Python 3 setup for the Notebook Server, with 'nbgitpuller' installed through requirements3.txt