Fix up the version constant

lib/probot.rb

@@ -2,6 +2,7 @@
 
 require "uri"
 require "net/http"
+require_relative "probot/version"
 
 # https://moz.com/learn/seo/robotstxt
 # https://stackoverflow.com/questions/45293419/order-of-directives-in-robots-txt-do-they-overwrite-each-other-or-complement-ea

lib/probot/version.rb

@@ -1,3 +1,3 @@
 class Probot
-  VERSION = "0.3.0"
+  VERSION = "0.4.0"
 end

test/test_helper.rb

@@ -2,6 +2,5 @@
 
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "probot"
-require "probot/version" # for testing the version number - otherwise the gemspec does it.
 
 require "minitest/autorun"