Clean up gitignore add adding PHPUnit (guzzle#2432)

* Clean up gitignore add adding PHPUnit

* minonr

Author: Nyholm

.gitignore

@@ -1,16 +1,16 @@
 phpunit.xml
 composer.phar
 composer.lock
-composer-test.lock
 vendor/
 build/artifacts/
 artifacts/
 docs/_build
 docs/*.pyc
-.idea
-.DS_STORE
 
 ### PHP-CS-Fixer
 php-cs-fixer.phar
 php-cs-fixer
-.php_cs.cache
+.php_cs.cache
+
+### PHPUnit
+.phpunit.result.cache