Fixed Shipkit link

Author: mockitoguy

src/main/java/org/shipkit/changelog/ChangelogFormat.java

@@ -25,7 +25,7 @@ public static String formatChangelog(Collection<String> contributors, Collection
                 "@improvements@";
 
         Map<String, String> data = new HashMap<String, String>() {{
-            put("header", "<sup><sup>*Changelog generated by [Shipkit Changelog Gradle Plugin](https://github.com/shipkit/org.shipkit.shipkit-changelog)*</sup></sup>");
+            put("header", "<sup><sup>*Changelog generated by [Shipkit Changelog Gradle Plugin](https://github.com/shipkit/shipkit-changelog)*</sup></sup>");
             put("version", version);
             put("date", date);
             put("commitCount", "" + commitCount);