Remove dupes for matrix

.travis.yml

-os:
-  - linux
-  - osx
 language: rust
 
-env:
-  - ARCH=x86_64
-
 matrix:
   include:
-    - env: TARGET=x86_64-unknown-linux-gnu
-    - env: TARGET=x86_64-apple-darwin
+    - env: 
+      - TARGET=x86_64-unknown-linux-gnu
+      - ARCH=x86_64
+    - env:
+      - TARGET=x86_64-apple-darwin
+      - ARCH=x86_64
       os: osx
 
-
 rust:
   - nightly