update requirements.txt

Author: terryyylim

requirements.txt

@@ -2,18 +2,26 @@ annoy==1.15.2
 certifi==2019.3.9
 chardet==3.0.4
 Click==7.0
+entrypoints==0.3
+flake8==3.7.7
 idna==2.8
 joblib==0.13.2
 lightfm==1.15
+mccabe==0.6.1
+mypy==0.701
+mypy-extensions==0.4.1
 numpy==1.16.3
 pandas==0.24.2
 psycopg2-binary==2.8.2
 PTable==0.9.2
+pycodestyle==2.5.0
+pyflakes==2.1.1
 python-dateutil==2.8.0
 pytz==2019.1
 requests==2.21.0
 scikit-learn==0.21.2
 scipy==1.2.1
 six==1.12.0
 sklearn==0.0
+typed-ast==1.3.5
 urllib3==1.24.3