Auto increment pre-release version to 1.0.8 [skip ci]

Author: realitycollectivebuildbot

package.json

@@ -8,7 +8,7 @@
     "Services",
     "Extensions"
   ],
-  "version": "1.0.8-pre.8",
+  "version": "1.0.8",
   "unity": "2020.3",
   "homepage": "https://serviceframework.realitycollective.net/",
   "bugs": {