Update setup.py

Included pyyaml to setup.py

Author: a-jean-andreasian

setup.py

@@ -2,14 +2,17 @@
 
 setup(
     name='not_gitmodules',
-    version='0.1.3',
+    version='0.1.3.1',
     packages=find_packages(),
     license='Custom License',
     entry_points={
         'console_scripts': [
             'not_gitmodules=not_gitmodules.cli:cli',
         ],
     },
+    install_requires=[
+        'pyyaml',
+    ],
     long_description=open('README.md').read(),
     long_description_content_type='text/markdown',
     author='Armen-Jean Andreasian',