Revert "build and test on various platforms"

This reverts commit 890d312.

Author: softprops

.travis.yml

@@ -10,13 +10,5 @@ branches:
 services:
   - docker
 
-matrix:
-  include:
-    - name: Linux Package
-    - name: OSX Package
-      os: osx
-    - name: Windows Package
-      os: windows
-
 script:
-  make test
+  make test