Bump version to 1.8pr1.8

While there haven't been a lot of changes, there's been a couple of bug
fixes and nice improvements.

Author: SquidDev

build.gradle

@@ -23,7 +23,7 @@ apply plugin: 'org.ajoberstar.grgit'
 apply plugin: 'maven-publish'
 apply plugin: 'maven'
 
-version = "1.80pr1.7"
+version = "1.80pr1.8"
 group = "org.squiddev"
 archivesBaseName = "cc-tweaked"