Add travis build status to README.

Author: twistor

.travis.yml

@@ -9,9 +9,6 @@ env:
   - COMPOSER_OPTS=""
   - COMPOSER_OPTS="--prefer-lowest"
 
-before_install:
-  - composer self-update
-
 install:
   - composer update --prefer-dist --no-interaction $COMPOSER_OPTS
 

README.md

@@ -1,6 +1,8 @@
 # phpstan-laravel
 Laravel plugins for [PHPStan](https://github.com/phpstan/phpstan)
 
+[![Build Status](https://img.shields.io/travis/Weebly/phpstan-laravel/master.svg?style=flat-square)](https://travis-ci.org/Weebly/phpstan-laravel)
+
 ## Usage
 
 To use this extension, require it in [Composer](https://getcomposer.org/):