add hamcrest dependency

Author: stefanseifert

parent_toplevel/pom.xml

@@ -142,6 +142,11 @@
         <artifactId>mockito-core</artifactId>
         <version>2.0.13-beta</version>
       </dependency>
+      <dependency>
+        <groupId>org.hamcrest</groupId>
+        <artifactId>hamcrest-core</artifactId>
+        <version>1.3</version>
+      </dependency>
 
     </dependencies>
   </dependencyManagement>