Revert "v1.8 branch"

Author: Chris Cho

config/build_conf.yaml

@@ -10,7 +10,7 @@ project:
   title: "PHP Library Manual"
   branched: true
 version:
-  release: '1.8'
+  release: '1.9-dev'
   branch: 'master'
 system:
   runstate: