updated install_requires 2

setup.py

@@ -21,8 +21,8 @@ setup(
     url='https://github.com/shaypal5/cachier',
     packages=find_packages(),
     install_requires=[
-        pymongo,
-        watchdog
+        'pymongo',
+        'watchdog'
     ],
     keywords=['cache', 'persistence', 'mongo', 'memoization', 'decorator'],
     classifiers=[],