Refactored to updated dictionary notation, :symbol_key => value to symbol_key: value
Revert "Refactored to updated dictionary notation, :symbol_key => value to symbol_key: value"

This reverts commit 759a5c24d798b0ecedcc33d6e79be7e3d9b6008e.
Merge branch 'master' of https://github.com/plaid/plaid-ruby
Updated the README.md for gem title