Update system image for Android

Author: jdnichollsc

.travis.yml

@@ -74,7 +74,7 @@ android:
     # Specify at least one system image,
     # if you need to run emulator(s) during your tests
     - sys-img-x86-android-28
-    - sys-img-armeabi-v7a-android-17
+    - sys-img-armeabi-v7a-android-22
 
 before_install:
     - sudo pip install --upgrade pip