Well, bundle gem is an awesome command!

.gitignore

@@ -1,2 +1,18 @@
-/lib/data/*.txt
 *.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+lib/data/*.txt

README.md

@@ -0,0 +1,29 @@
+# Zip::Codes
+
+TODO: Write a gem description
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem 'zip-codes'
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install zip-codes
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

lib/zip-codes.rb

@@ -1,6 +1,8 @@
 require 'yaml'
 
 module ZipCodes
+  VERSION = '0.1.0'
+
   class << self
     def identify code
       db[code]

zip-codes.gemspec

@@ -5,7 +5,7 @@ require 'grape/kaminari/version'
 
 Gem::Specification.new do |spec|
   spec.name          = "zip-codes"
-  spec.version       = "0.1.0"
+  spec.version       = ZipCodes::VERSION
   spec.authors       = ["Michał Duda"]
   spec.email         = ["[email protected]"]
   spec.description   = %q{Identify city and state for given zip code}