Fixed a bug, where doors could be one block up and still be opened

Fixed bugs:

• The plugin now only opens doors that are ment to be open (in case you have a wall of doors, the plugin opened doors left and right from the door you intended to open)

DoubleDoors Version 1.2

Changes:

• Removed warnings about using logger and not System.out/err.print (Thanks Badfoxrox, see PR#3)
• Removed doors being opened by a accidental left click (Again, Thanks Badfoxrox, see PR#3)
• Added author to plugin.yml

DoubleDoors v1.1

Fixed bugs:

• Now ignoring iron doors (we don't want people to break into our bases just by placing a wooden door next to our iron door, do we?)