#190 Remove urm plugin

mutex/etc/mutex.urm.puml

@@ -1,27 +0,0 @@
-@startuml
-package com.iluwatar.mutex {
-  class App {
-    + App()
-    + main(args : String[]) {static}
-  }
-  class Jar {
-    - beans : int
-    - lock : Lock
-    + Jar(beans : int, lock : Lock)
-    + takeBean() : boolean
-  }
-  interface Lock {
-    + acquire() {abstract}
-    + release() {abstract}
-  }
-  class Mutex {
-    - owner : Object
-    + Mutex()
-    + acquire()
-    + getOwner() : Object
-    + release()
-  }
-}
-Jar -->  "-lock" Lock
-Mutex ..|> Lock 
-@enduml