#190 Remove urm plugin

double-checked-locking/etc/double-checked-locking.urm.puml

@@ -1,22 +0,0 @@
-@startuml
-package com.iluwatar.doublechecked.locking {
-  class App {
-    - LOGGER : Logger {static}
-    + App()
-    + main(args : String[]) {static}
-  }
-  class Inventory {
-    - LOGGER : Logger {static}
-    - inventorySize : int
-    - items : List<Item>
-    - lock : Lock
-    + Inventory(inventorySize : int)
-    + addItem(item : Item) : boolean
-    + getItems() : List<Item>
-  }
-  class Item {
-    + Item()
-  }
-}
-Inventory -->  "-items" Item
-@enduml