Convert version file to a standard format

lib/solidus_i18n/version.rb

@@ -1,20 +1,5 @@
 # frozen_string_literal: true
 
 module SolidusI18n
-  module_function
-
-  # Returns the version of the currently loaded SolidusI18n as a
-  # <tt>Gem::Version</tt>.
-  def version
-    Gem::Version.new VERSION::STRING
-  end
-
-  module VERSION
-    MAJOR = 2
-    MINOR = 0
-    TINY  = 0
-    PRE   = nil
-
-    STRING = [MAJOR, MINOR, TINY, PRE].compact.join('.')
-  end
+  VERSION = '2.0.0'
 end

solidus_i18n.gemspec

@@ -5,7 +5,7 @@ require 'solidus_i18n/version'
 
 Gem::Specification.new do |s|
   s.name        = 'solidus_i18n'
-  s.version     = SolidusI18n.version
+  s.version     = SolidusI18n::VERSION
   s.summary     = 'Provides locale information for use in Solidus.'
   s.description = 'A collection of translations for Solidus.'