README: fix link for waffle

README.md

@@ -1,7 +1,7 @@
 
 # rpclib ![MIT](https://img.shields.io/badge/license-MIT-blue.svg) [![Build Status](https://travis-ci.org/rpclib/rpclib.svg?branch=master)](https://travis-ci.org/rpclib/rpclib) [![Build status](https://ci.appveyor.com/api/projects/status/9lft2tlamcox8epq?svg=true)](https://ci.appveyor.com/project/sztomi/callme) [![Coverage Status](https://img.shields.io/codecov/c/github/rpclib/rpclib/dev.svg)](https://img.shields.io/codecov/c/github/rpclib/rpclib/dev.svg) ![Coverity](https://scan.coverity.com/projects/7259/badge.svg?flat=1) [![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg?maxAge=2592000)](https://gitter.im/rpclib/Lobby)
 
-![waffle](https://badge.waffle.io/rpclib/rpclib.svg?columns=In%20Progress,Waiting%20For%20Release)
+[![waffle](https://badge.waffle.io/rpclib/rpclib.svg?columns=In%20Progress,Waiting%20For%20Release)](https://waffle.io/rpclib/rpclib)
 
 `rpclib` is a RPC library for C++, providing both a client and server implementation. It is built using modern C++14, and as such, requires a recent compiler. Main highlights: