Update readme

Author: Christian Blank

README.md

@@ -1,6 +1,8 @@
 Sorting Module
 ==============
 
+[![Build Status](https://travis-ci.org/1blankz7/php-sorting.svg?branch=master)](https://travis-ci.org/1blankz7/php-sorting)
+
 Implementation of a generic sorting system with an interface definition compatible
 to the [Comparable RFC](https://wiki.php.net/rfc/comparable).
 

tests/Unit/SortManagerTest.php

@@ -70,7 +70,8 @@ public function itShouldCallCompareToOnOneComparable()
     {
         $comparable1 = $this->getComparable();
         $comparable2 = $this->getComparable();
-        $comparable2->compareTo($comparable1->reveal())->willReturn(-1)->shouldBeCalled();
+        $comparable2->compareTo($comparable1->reveal())->willReturn(-1);
+        $comparable1->compareTo($comparable2->reveal())->willReturn(1);
 
         $this->sortManager->sortComparable([$comparable1->reveal(), $comparable2->reveal()]);
     }