requirements.txt fixed for python 3.4

Author: arunsureshkumar

requirements.txt

@@ -12,7 +12,7 @@ pymongo==3.11.2
 pytest==4.6.11; python_version <= '3.5'
 pytest==6.2.1; python_version > '3.5'
 pytest-cov==2.8.1; python_version == '3.5' or python_version == '3.4'
-pytest-cov==2.10.1; python_version < '3.5' or python_version > '3.5'
+pytest-cov==2.10.1; python_version < '3.4' or python_version > '3.5'
 singledispatch==3.4.0.3
 # https://stackoverflow.com/a/58189684/9041712
 attrs==20.2.0