build: upgrade realm version to latest one
build: upgrade realm version to latest one

seems the old version doesn't work on my Pixle with Android 8.

    java.lang.NullPointerException: Attempt to invoke virtual method
    'void io.realm.ProxyState.setConstructionFinished()' on a null object reference

walkingice/MomoDict,walkingice/MomoDict,walkingice/MomoDict