Add required dependency for nick colours.

.idea/nickcolours.iml

@@ -26,5 +26,6 @@
     <orderEntry type="library" exported="" name="Gradle: com.squareup:javawriter:2.3.0" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: junit:junit:4.12" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: org.mockito:mockito-all:1.10.17" level="project" />
+    <orderEntry type="library" exported="" name="Gradle: com.google.auto.value:auto-value:1.0" level="project" />
   </component>
 </module>