Run flake8 on diff with master branch

Author: pberganza-applaudostudios

.circleci/config.yml

@@ -52,7 +52,10 @@ jobs:
       - checkout
       - run: pip install --user .
       - run: sudo pip install setuptools coverage pylint==1.9.3 pycodestyle flake8
-      - run: flake8 --max-complexity=10 ./analytics
+      - run:
+          name: Linting with Flake8
+          command: |
+            git diff origin/master..HEAD analytics | flake8 --diff --max-complexity=10 analytics
       - run: make test
       - run: make e2e_test
 
@@ -63,7 +66,10 @@ jobs:
       - checkout
       - run: pip install --user .
       - run: sudo pip install coverage pylint==1.9.3 pycodestyle flake8
-      - run: flake8 --max-complexity=10 ./analytics
+      - run:
+          name: Linting with Flake8
+          command: |
+            git diff origin/master..HEAD analytics | flake8 --diff --max-complexity=10 analytics
       - run: make test
       - run: make e2e_test