SDK-1229: Update travis file

Author: MrBurtyyy

.travis.yml

@@ -16,7 +16,7 @@ jobs:
         - pip install -U setuptools
       install:
         - pip install -r requirements.txt
-        - python setup.py develop
+        - pip install -e .[dev]
       script:
         - py.test -v
     - <<: *test