[update] travis-ci :boom:

.travis.yml

@@ -1,7 +1,10 @@
 language: python
 python:
-  - 2.7
-  # - nightly
+  - "2.7"
+  - "3.4"
+  - "3.5"
+  - "3.6"
+  - "3.7"
 os:
   - linux
 install: