Build for ARM

.travis.yml

 - rm -Rf ./dist
 - go get github.com/mitchellh/gox
 - gox -ldflags="-X main.branch=$TRAVIS_TAG -X main.revision=$TRAVIS_COMMIT" -os="linux
-  darwin" -arch="amd64 386" -output="dist/{{.OS}}_{{.Arch}}_{{.Dir}}"
+  darwin" -arch="amd64 386 arm" -output="dist/{{.OS}}_{{.Arch}}_{{.Dir}}"
 deploy:
   provider: releases
   api_key:
     - dist/linux_386_irccat
     - dist/darwin_amd64_irccat
     - dist/darwin_386_irccat
+    - dist/darwin_arm_irccat
   skip_cleanup: true
   on:
     tags: true