Update .travis.yml

.travis.yml

@@ -5,5 +5,14 @@ addons:
   apt:
     update: true
     packages: shellcheck
+    
+install:
+ - pip install -U pip
+ - pip install -U flake8
+ - if [[ $TRAVIS_PYTHON_VERSION == 3.6 ]]; then pip install -U black; fi
 
-script: "for file in $(find . -type f -name \"*.sh\"); do shellcheck --format=gcc $file; done;"
+script:
+ - for file in $(find . -type f -name \"*.sh\"); do shellcheck --format=gcc $file; done;
+ - cd benchmark/data
+ - flake8 --statistics --count
+ - if [[ $TRAVIS_PYTHON_VERSION == 3.6 ]]; then black --check --diff .; fi