Correct hamcrest dependency (#348)

Author: elharo

pom.xml

@@ -346,7 +346,7 @@ under the License.
     </dependency>
     <dependency>
       <groupId>org.hamcrest</groupId>
-      <artifactId>hamcrest-core</artifactId>
+      <artifactId>hamcrest</artifactId>
       <version>3.0</version>
       <scope>test</scope>
     </dependency>