Replaced Travis build badge with CircleCI build badge.

Author: rfmeier

Gruntfile.js

@@ -21,7 +21,7 @@ module.exports = function(grunt) {
 
 // Add build status image to GitHub readme.
 function addBuildStatus(readme) {
-	var buildImage = '<a href="https://travis-ci.org/wpengine/phpcompat"><img src="https://travis-ci.org/wpengine/phpcompat.svg?branch=master"></a>';
+	var buildImage = '<a href="https://circleci.com/gh/wpengine/phpcompat/tree/master"><img src="https://circleci.com/gh/wpengine/phpcompat/tree/master.svg?style=shield"></a>';
 
 	return readme.replace(/# PHP Compatibility Checker #/, '# PHP Compatibility Checker ' + buildImage);
 }

readme.md

@@ -1,11 +1,11 @@
-# PHP Compatibility Checker <a href="https://travis-ci.org/wpengine/phpcompat"><img src="https://travis-ci.org/wpengine/phpcompat.svg?branch=master"></a>
-**Contributors:** [wpengine](https://profiles.wordpress.org/wpengine), [octalmage](https://profiles.wordpress.org/octalmage), [stevenkword](https://profiles.wordpress.org/stevenkword), [Taylor4484](https://profiles.wordpress.org/Taylor4484), [pross](https://profiles.wordpress.org/pross), [jcross](https://profiles.wordpress.org/jcross)
-**Tags:** php 7, php 5.5, php, version, compatibility, checker, wp engine, wpe, wpengine
-**Requires at least:** 3.5
-**Tested up to:** 5.2.2
-**Stable tag:** 1.5.0
-**License:** GPLv2 or later
-**License URI:** http://www.gnu.org/licenses/gpl-2.0.html
+# PHP Compatibility Checker <a href="https://circleci.com/gh/wpengine/phpcompat/tree/master"><img src="https://circleci.com/gh/wpengine/phpcompat/tree/master.svg?style=shield"></a>
+**Contributors:** [wpengine](https://profiles.wordpress.org/wpengine), [octalmage](https://profiles.wordpress.org/octalmage), [stevenkword](https://profiles.wordpress.org/stevenkword), [Taylor4484](https://profiles.wordpress.org/Taylor4484), [pross](https://profiles.wordpress.org/pross), [jcross](https://profiles.wordpress.org/jcross)  
+**Tags:** php 7, php 5.5, php, version, compatibility, checker, wp engine, wpe, wpengine  
+**Requires at least:** 3.5  
+**Tested up to:** 5.2.2  
+**Stable tag:** 1.5.0  
+**License:** GPLv2 or later  
+**License URI:** http://www.gnu.org/licenses/gpl-2.0.html  
 
 Make sure your plugins and themes are compatible with newer PHP versions.
 
@@ -56,7 +56,7 @@ PHP Compatibility Checker includes WP-CLI command support:
 
 	<version>
 	    PHP version to test.
-
+	
 	[--scan=<scan>]
 	  Whether to scan only active plugins and themes or all of them.
 	  default: active