Updated mce version to @since 1.12.8
Updated mce version to @since 1.12.8

The mce 1.12.7 was released without cpu-keepalive plugin.

kimmoli/mce-dev,android-808/mce-dev,spiiroin/mce-dev,android-808/mce-dev,kimmoli/mce-dev,spiiroin/mce-dev