Switch to New Ruby Hash Syntax

Try and run this in your terminal:
find . -name \*.\*rb -exec perl -p -i -e 's/([^:]):(\w+)\s?(\s*)=>\s?(\s*)/\1\2: \3\4/g' {} \;

When working on old Ruby code, you'll see the old (<= 1.9) hash syntax:

{
  :name     => "Mads",
  :age      => "25",
  :position => "Lead developer"
}

However, often in new projects you'll want to use the new:

{
  name:     "Mads",
  age:      "25",
  position: "Lead developer"
}