Remove CodeClimate from README

Author: metaskills

README.md

@@ -2,7 +2,6 @@
 
 * [![TravisCI](https://travis-ci.org/rails-sqlserver/tiny_tds.svg?branch=master)](https://travis-ci.org/rails-sqlserver/tiny_tds) - TravisCI
 * [![Build Status](https://ci.appveyor.com/api/projects/status/g2bhhbsdkx0mal55/branch/master?svg=true)](https://ci.appveyor.com/project/rails-sqlserver/tiny-tds/branch/master) - Appveyor
-* [![Code Climate](https://codeclimate.com/github/rails-sqlserver/tiny_tds/badges/gpa.svg)](https://codeclimate.com/github/rails-sqlserver/tiny_tds) - Code Climate
 * [![Gem Version](https://img.shields.io/gem/v/tiny_tds.svg)](https://rubygems.org/gems/tiny_tds) - Gem Version
 * [![Dependency Status](https://dependencyci.com/github/rails-sqlserver/tiny_tds/badge)](https://dependencyci.com/github/rails-sqlserver/tiny_tds) - Dependency Status
 * [![Gitter chat](https://img.shields.io/badge/%E2%8A%AA%20GITTER%20-JOIN%20CHAT%20%E2%86%92-brightgreen.svg?style=flat)](https://gitter.im/rails-sqlserver/activerecord-sqlserver-adapter) - Community