Revert "Try to add workaround for warnings"

This reverts commit a5e5cfa3f650d4e78fb50e2df15c102ab56fca3c.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64600 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/psych/lib/psych/versions.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 module Psych
   # The version is Psych you're using
-  VERSION ||= '3.1.0.pre1'
+  VERSION = '3.1.0.pre1'
 
   if RUBY_ENGINE == 'jruby'
     DEFAULT_SNAKEYAML_VERSION = '1.21'.freeze