scripts: fix android travis build

scripts/travis_android_deps.sh

@@ -19,7 +19,7 @@ NDK_BUNDLE="ndk-bundle"
 if [ "$1" = "r10e" ]; then
 	NDK_BUNDLE=""
 fi
-sdk/tools/bin/sdkmanager --install build-tools\;29.0.1 platform-tools platforms\;android-19 $NDK_BUNDLE > /dev/null 2>/dev/null
+sdk/tools/bin/sdkmanager --install build-tools\;29.0.1 platform-tools platforms\;android-28 $NDK_BUNDLE > /dev/null 2>/dev/null
 if [ "$1" = "r10e" ]; then
 	wget http://dl.google.com/android/ndk/android-ndk-r10e-linux-x86_64.bin >/dev/null 2>/dev/null
 	7z x ./android-ndk-r10e-linux-x86_64.bin > /dev/null