Fix version and update checking when using symlinks

Author: rastating

wpxf.rb

@@ -7,8 +7,10 @@
 
 begin
   Slop.parse do |o|
+    version_file_path = File.join(Wpxf.app_path, 'VERSION')
+
     o.on '--update', 'check for updates' do
-      current_version = File.read('VERSION').strip
+      current_version = File.read(version_file_path).strip
 
       updater = Wpxf::GitHubUpdater.new
       update = updater.get_update(current_version)
@@ -32,7 +34,7 @@
     end
 
     o.on '--version', 'print the version' do
-      puts File.read('VERSION').strip
+      puts File.read(version_file_path).strip
       exit
     end
   end