Fixed some code styling issues.

Author: Martin Brecht-Precht

.codeclimate.yml

@@ -27,4 +27,4 @@ ratings:
   - "**.rb"
 exclude_paths:
 - test/
-- vendor/
+- vendor/

README.md

@@ -191,4 +191,4 @@ Contributing to our projects is always very appreciated.
 
 ## License
 
-PHP Stack Util is under the MIT license.
+PHP Stack Util is under the MIT license.

phpunit.xml.dist

@@ -14,4 +14,4 @@
 			</exclude>
 		</whitelist>
 	</filter>
-</phpunit>
+</phpunit>

src/StackInterface.php

@@ -39,4 +39,4 @@ public function push($item);
 	 */
 	public function pop();
 
-}
+}