fixed common-chunk-grandchildren example

* fixed README.md
 * pass error to done in test

examples/common-chunk-grandchildren/build.js

@@ -1 +1,2 @@
+global.NO_TARGET_ARGS = true;
 require("../build-common");

test/configCases/commons-chunk-plugin/move-to-grandparent/index.js

@@ -7,6 +7,6 @@ it("should correctly include indirect children in common chunk", function(done)
 		imports[1].default.should.be.eql("reuse");
 		done();
 	}).catch(e => {
-		done();
+		done(e);
 	})
 });