Add Travis-CI widget

Author: tcz

README.md

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 ## Introduction ##
 
 MockFunction is a PHPUnit extension that uses `runkit` to mock PHP functions (both user-defined and system) or static methods and use mockobject-style invocation matchers, parameter constraints and all that magic.
@@ -55,7 +54,7 @@ You can use all invocation matchers, constraints and stub returns, for example:
             )
         )->will( $this->returnValue( true ) );
 
-For further information see http://www.phpunit.de/manual/3.0/en/mock-objects.html
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-[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/tcz/phpunit-mockfunction/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
-
+For further information see http://www.phpunit.de/manual/3.0/en/mock-objects.html
+
+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/tcz/phpunit-mockfunction/trend.png)](https://bitdeli.com/free "Bitdeli Badge") [![Build Status](https://travis-ci.org/tcz/phpunit-mockfunction.svg?branch=master)](https://travis-ci.org/tcz/phpunit-mockfunction)
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