(amihaiemil#127) Image.run()

As per PR review:
Fixed assertion in RtImageTestCase.runsItselfOk()

Author: llorllale

src/test/java/com/amihaiemil/docker/RtImageTestCase.java

@@ -322,7 +322,7 @@ public void runsItselfOk() throws Exception {
                 URI.create("http://localhost/images/image123"),
                 DOCKER
             ).run(),
-            Matchers.notNullValue()
+            Matchers.is(container)
         );
         MatcherAssert.assertThat(
             started.get(),