Remove arm64 from build matrix

.travis.yml

@@ -5,9 +5,9 @@ matrix:
     - os: linux
       sudo: required
       env: BUILDARCH=ia32
-    - os: linux
-      sudo: required
-      env: BUILDARCH=arm64
+#    - os: linux
+#      sudo: required
+#      env: BUILDARCH=arm64
     - os: osx
 
 language: node_js