Add statistics function for #97 "equal" in the switch rather than "notModified"

Author: JBlond

example/example.php

@@ -77,7 +77,7 @@ function changeCSS(cssFile, cssLinkIndex) {
     ?>% match.<br>
     Inserted lines: <?php echo $stats['inserted']; ?><br>
     Deleted lines: <?php echo $stats['deleted']; ?><br>
-    Not modified lines: <?php echo $stats['notModified']; ?><br>
+    Not modified lines: <?php echo $stats['equal']; ?><br>
     Lines with replacement: <?php echo $stats['replaced']; ?><br>
 </aside>
 <hr>

lib/jblond/Diff/Similarity.php

@@ -232,10 +232,10 @@ private function ratioReduce(int $sum, array $triple): int
     public function getDifference(): array
     {
         $return = [
-            'inserted'     => 0,
-            'deleted'      => 0,
-            'notModified'  => 0,
-            'replaced'     => 0,
+            'inserted' => 0,
+            'deleted'  => 0,
+            'equal'    => 0,
+            'replaced' => 0,
         ];
 
         foreach ($this->getGroupedOpCodes() as $chunk) {
@@ -254,7 +254,7 @@ public function getDifference(): array
             }
         }
 
-        $return['notModified'] = count($this->old) - $return['replaced'] - $return['deleted'];
+        $return['equal'] = count($this->old) - $return['replaced'] - $return['deleted'];
 
         return $return;
     }

tests/Diff/SimilarityTest.php

@@ -42,7 +42,7 @@ public function testGetDifference(): void
             [
                 'inserted'    => 13,
                 'deleted'     => 1,
-                'notModified' => 10,
+                'equal' => 10,
                 'replaced'    => 0,
             ],
             $similarity->getDifference()