Added codeclimate badge to README after activating integration.

Author: numbleroot

README.md

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 # Pluto
 
-[![GoDoc](https://godoc.org/github.com/numbleroot/pluto?status.svg)](https://godoc.org/github.com/numbleroot/pluto) [![License: GPLv3](https://img.shields.io/badge/license-GPLv3-blue.svg)](https://github.com/numbleroot/pluto/blob/master/LICENSE) [![Build Status](https://travis-ci.org/numbleroot/pluto.svg?branch=master)](https://travis-ci.org/numbleroot/pluto) [![Go Report Card](https://goreportcard.com/badge/github.com/numbleroot/pluto)](https://goreportcard.com/report/github.com/numbleroot/pluto) [![codecov](https://codecov.io/gh/numbleroot/pluto/branch/master/graph/badge.svg)](https://codecov.io/gh/numbleroot/pluto)
+[![GoDoc](https://godoc.org/github.com/numbleroot/pluto?status.svg)](https://godoc.org/github.com/numbleroot/pluto) [![License: GPLv3](https://img.shields.io/badge/license-GPLv3-blue.svg)](https://github.com/numbleroot/pluto/blob/master/LICENSE) [![Build Status](https://travis-ci.org/numbleroot/pluto.svg?branch=master)](https://travis-ci.org/numbleroot/pluto) [![Go Report Card](https://goreportcard.com/badge/github.com/numbleroot/pluto)](https://goreportcard.com/report/github.com/numbleroot/pluto) [![Issue Count](https://codeclimate.com/github/numbleroot/pluto/badges/issue_count.svg)](https://codeclimate.com/github/numbleroot/pluto) [![codecov](https://codecov.io/gh/numbleroot/pluto/branch/master/graph/badge.svg)](https://codecov.io/gh/numbleroot/pluto)
 
 Pluto is a distributed IMAP server that implements a subset of the [IMAPv4 standard](https://tools.ietf.org/html/rfc3501). It makes use of [Conflict-free Replicated Data Types](https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type) defined by Shapiro et al. to replicate application state into traditionally stateless tiers (worker nodes) and still achieve system-wide convergence of user data. By this, pluto attempts to offer a solution towards the challenges arising from Brewer's [CAP theorem](https://en.wikipedia.org/wiki/CAP_theorem): in case of failures in the system, choose to stay available by accepting reduced consistency in form of the CRDT's [strong eventual consistency](https://en.wikipedia.org/wiki/Eventual_consistency#Strong_eventual_consistency). Pluto is written in Go and provided under copyleft license [GPLv3](https://github.com/numbleroot/pluto/blob/master/LICENSE).
 
@@ -143,4 +143,4 @@ I would like to thank my thesis supervisor [Tim Jungnickel](https://github.com/T
 
 ## License
 
-This project is [GPLv3](https://github.com/numbleroot/pluto/blob/master/LICENSE) licensed.
+This project is [GPLv3](https://github.com/numbleroot/pluto/blob/master/LICENSE) licensed.