chore: add script/fmt

Author: DirtyF

script/cibuild

@@ -1,2 +1,6 @@
 #!/usr/bin/env bash
-./script/test
+
+set -e
+
+bundle exec rake test
+script/fmt

script/fmt

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+
+echo "Rubocop $(bundle exec rubocop --version)"
+bundle exec rubocop -D -E $@
+success=$?
+if ((success != 0)); then
+   echo -e "\nTry running \`script/fmt -safe-auto-correct\` to automatically fix errors"
+fi
+exit $success