Update Travis file to support Android 27

Bilal · Bilal · commit 42ef06bb9a21 · 2018-08-30T10:33:25.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -13,6 +13,7 @@ android:
     - build-tools-27.0.3
 
     # The SDK version used to compile your project
+    - android-27
     - android-26
     - android-22 #For emulator
     # Specify at least one system image,
