updated travis conf

Author: hiteshsondhi88

.travis.yml

@@ -10,7 +10,7 @@ android:
     # The SDK version used to compile your project
     - android-16
 
-    - sys-img-x86-android-19
+    - sys-img-x86-android-16
     - sys-img-armeabi-v7a-android-16
     - sys-img-armeabi-v7a-android-l
     - sys-img-x86-android-l