ci(travis): Remove android 4.4 that SauceLabs removed

Author: janpio

.travis.yml

@@ -55,8 +55,6 @@ matrix:
     - env: PLATFORM=ios-12.2
       <<: *_ios
 
-    - env: PLATFORM=android-4.4
-      <<: *_android
     - env: PLATFORM=android-5.1
       <<: *_android
     - env: PLATFORM=android-6.0