Revert "remove failing platforms"

This reverts commit 007d50d.

Author: janpio

.travis.yml

@@ -29,6 +29,10 @@ matrix:
     - env: ADDITIONAL_TESTS_DIR=./tests/ios
       <<: *_ios
 
+    # local tests, without saucelabs
+    - env: PLATFORM=local/ios-10.0
+      <<: *_ios
+
     # many tests with saucelabs
     - env: PLATFORM=ios-11.3
       <<: *_ios