Test on Linux, macOS and Windows
diff --git a/.travis.yml b/.travis.yml
index 3e67b0f..bd66105 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,9 @@
 language: rust
 
-os: linux
+os:
+  - linux
+  - osx
+  - windows
 
 rust: nightly