Bump version to 0.18.0

Author: albrow

README.md

@@ -1,7 +1,7 @@
 Zoom
 ====
 
-[![Version](https://img.shields.io/badge/version-develop-5272B4.svg)](https://github.com/albrow/zoom/releases)
+[![Version](https://img.shields.io/badge/version-0.18.0-5272B4.svg)](https://github.com/albrow/zoom/releases)
 [![Circle CI](https://img.shields.io/circleci/project/albrow/zoom/master.svg)](https://circleci.com/gh/albrow/zoom/tree/master)
 [![GoDoc](https://godoc.org/github.com/albrow/zoom?status.svg)](https://godoc.org/github.com/albrow/zoom)
 

doc.go

@@ -8,7 +8,7 @@
 // atomic transactions, lua scripts, and running Redis commands
 // directly if needed.
 //
-// Version X.X.X
+// Version 0.18.0
 //
 // For installation instructions, examples, and more information
 // visit https://github.com/albrow/zoom.