fix: defined Atco::VERSION to the correct released version and move t…

…o separate file

lib/atco.rb

@@ -8,10 +8,9 @@
 require 'atco/location'
 require 'atco/journey'
 require 'atco/stop'
+require 'atco/version'
 
 module Atco
-  VERSION = '0.0.1'
-
   class << self
     @path = nil
     @@methods = {

lib/atco/version.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+module Atco
+  VERSION = '1.0.0'
+end

spec/atco_spec.rb

@@ -7,6 +7,10 @@
   before(:all) do
   end
 
+  it 'has a version number' do
+    expect(Atco::VERSION).not_to be nil
+  end
+
   it 'should output file for debugging!' do
     result = Atco.parse('spec/fixtures/example.cif')
     File.open('test.output', 'w+') do |f|