Update .travis.yml

Author: jedymatt

.travis.yml

@@ -12,7 +12,8 @@ before_install:
     - pip3 install --upgrade pip
 install:
     - pip install -r requirements.txt
-    - pip install . --use-feature=in-tree-build
+#     - pip install . --use-feature=in-tree-build
+    - pip install -e .
     - pip install pytest
     - pip install codecov
 script: