Add build status to readme.md.

Author: octalmage

Gruntfile.js

@@ -3,7 +3,8 @@ module.exports = function(grunt) {
 	grunt.initConfig({
 		wp_readme_to_markdown: {
 			options: {
-				screenshot_url: 'assets/{screenshot}.png'
+				screenshot_url: 'assets/{screenshot}.png',
+				post_convert: addBuildStatus,
 			},
 			your_target: {
 				files: {
@@ -19,3 +20,10 @@ module.exports = function(grunt) {
 		'wp_readme_to_markdown'
 	]); 
 };
+
+// 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>';
+	
+	return readme.replace(/# PHP Compatibility Checker #/, '# PHP Compatibility Checker # ' + buildImage);
+}

readme.md

@@ -1,4 +1,4 @@
-# PHP Compatibility Checker #
+# 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)  
 **Tags:** php 7, php 5.5, php, version, compatibility, checker, wp engine, wpe, wpengine  
 **Requires at least:** 3.0.1