Update .travis.yml

PeterStaev · web-flow · commit 6881e15690c9 · 2017-09-19T09:51:51.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,7 @@ android:
     - platform-tools
     - build-tools-25.0.2
     - android-25
+    - android-23
     - extra-android-m2repository
 
 before_cache:
