Merge branch 'pmd/new-rule-9' into 'master'

Ref: add new static analyser rule: category/java/bestpractices.xml/MissingOverride

See merge request sheepitrenderfarm/client!322

src/main/java/com/sheepit/client/Configuration.java

@@ -121,7 +121,7 @@ import lombok.Data;
 	/**
 	 * @return string formatted with SheepIt Admin Log Viewer in mind
 	 */
-	public String toString() {
+	@Override public String toString() {
 		String c = "    CFG: ";
 		String n ="\n";
 		return