fixed phpunit-coverage message & rule if it is increased higher=better!

src/Plugin/BitbucketNotify.php

@@ -312,7 +312,7 @@ public function getPhpUnitCoverage($targetBranch)
         );
         $currentBranchCoverage = json_decode($currentMetaData->getMetaValue(), true);
 
-        return new BitbucketNotifyPluginResult(
+        return new Plugin\Util\BitbucketNotifyPhpUnitResult(
             PhpUnit::pluginName() . '-coverage',
             isset($targetBranchCoverage['lines']) ? $targetBranchCoverage['lines'] : 0,
             isset($currentBranchCoverage['lines']) ? $currentBranchCoverage['lines'] : 0

src/Plugin/Util/BitbucketNotifyPhpUnitResult.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace PHPCensor\Plugin\Util;
+
+class BitbucketNotifyPhpUnitResult extends BitbucketNotifyPluginResult
+{
+    public function isImproved()
+    {
+        return $this->right > $this->left;
+    }
+
+    public function isDegraded()
+    {
+        return $this->right < $this->left;
+    }
+}