Added ability to set title for SideBySide renderer

Author: sergeyklay

CHANGELOG.md

@@ -1,3 +1,7 @@
+# [2.0.4](https://github.com/phalcongelist/php-diff/releases/tag/v2.0.4) (2016-XX-XX)
+
+* Added ability to set title for `SideBySide` renderer
+
 # [2.0.3](https://github.com/phalcongelist/php-diff/releases/tag/v2.0.3) (2016-07-18)
 
 * Fixed `BaseArray` class name

src/Diff/Renderer/Html/SideBySide.php

@@ -25,6 +25,9 @@
  */
 class SideBySide extends BaseArray
 {
+    private $oldTitle = 'Old Version';
+    private $newTitle = 'New Version';
+
     /**
      * Render a and return diff with changes between the two sequences
      * displayed side by side.
@@ -40,11 +43,19 @@ public function render()
             return $html;
         }
 
+        if (isset($this->options['oldTitle'])) {
+            $this->oldTitle = $this->options['oldTitle'];
+        }
+
+        if (isset($this->options['newTitle'])) {
+            $this->newTitle = $this->options['newTitle'];
+        }
+
         $html .= '<table class="Differences DifferencesSideBySide">';
         $html .= '<thead>';
         $html .= '<tr>';
-        $html .= '<th colspan="2">Old Version</th>';
-        $html .= '<th colspan="2">New Version</th>';
+        $html .= '<th colspan="2">' . $this->oldTitle . '</th>';
+        $html .= '<th colspan="2">' . $this->newTitle . '</th>';
         $html .= '</tr>';
         $html .= '</thead>';