fix yml for gitlab build

Lawrence Nahum · jgriffiths · commit 824d7a321108 · 2017-08-07T12:00:14.000+12:00
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
@@ -25,4 +25,4 @@ build_tag_release:
     - gzip -9 wallycore-android-jni.tar
     - shasum -a 256 wallycore-android-jni.tar.gz > wallycore-android-jni.tar.gz.sha256
   only:
-    - tag
+    - tags
