added flag 'threadSafe = true' to CheckMojo class

Author: Vladimir.Shapkin

qulice-maven-plugin/src/main/java/com/qulice/maven/CheckMojo.java

@@ -58,7 +58,8 @@
  * @since 0.3
  */
 @Mojo(name = "check", defaultPhase = LifecyclePhase.VERIFY,
-    requiresDependencyResolution = ResolutionScope.TEST)
+    requiresDependencyResolution = ResolutionScope.TEST,
+    threadSafe = true)
 public final class CheckMojo extends AbstractQuliceMojo {
 
     /**