While using okbuck, we cannot have more than 1 proguard file. So I removed `proguard-android-optimiz...

# build-tools

[BMG]

While using okbuck, we cannot have more than 1 proguard file. So I removed proguard-android-optimize.txt as recommended in the https://github.com/uber/okbuck/issues/601#issuecomment-377969435. Now won’t I lose the benefits of android-optimize.txt? Or should I copy the entire proguard-android-optimize.txt to my application proguard file to satisfy okbuck?