lib/unicode_normalize.rb: Changing module name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48013 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
lib/unicode_normalize.rb: Changing method names, see https://bugs.ruby-lang.org/issues/10084#note-7

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48014 b2dd03c8-39d4-4d8f-98ff-823fe69b080e