fix for travis.yml

Author: valen90

.travis.yml

@@ -1,8 +1,8 @@
 os:
-    - linux
-    - osx
+  - linux
 language: generic
 sudo: required
 dist: trusty
 script:
-    - eval "$(curl -sL https://swift.vapor.sh/ci-3.1)"
+  - eval "$(curl -sL https://gist.githubusercontent.com/BrettRToomey/1256d98cce5546c696cc68d9f61ad46f/raw/d5fb266a17f26c41b59fd00867a3a2474c3efee3/TravisSwift31)"
+  - eval "$(curl -sL https://swift.vapor.sh/codecov)"