Update vimperator version to 3.11.2

While trying to see if I can sign the xpi automatically for a github
release, I uploaded a new xpi and ended up disabling a perious review
build. Once a version is uploaded, even if deleted, another file with
the same version cannot be re-uploaded so, bumped the version to 3.11.2.

Author: gkatsev

vimperator/Makefile

@@ -1,6 +1,6 @@
 #### configuration
 
-VERSION       = 3.11
+VERSION       = 3.11.2
 NAME          = vimperator
 
 include ../common/Makefile