Tried to fix Travis

Author: Rijul1999

.travis.yml

@@ -7,9 +7,19 @@ os:
 sudo: false
 
 python:
-    - 2.7
-    - 3.5
-    - 3.6
+  - "2.6"
+  - "2.7"
+  - "3.2"
+  - "3.3"
+  - "3.4"
+  - "3.5"
+  - "3.5-dev" # 3.5 development branch
+  - "3.6"
+  - "3.6-dev" # 3.6 development branch
+  - "3.7-dev" # 3.7 development branch
+  - "nightly"
+
+# command to install dependencies
 
 install:
   - pip install -r requirements.txt