add new TypedName node

[scottbelden]

Depends on PyCQA/baron#140

I'm not sure if this is correct or if I need to add tests, but it seems to work from what I can tell...

In [1]: from redbaron import RedBaron

In [2]: a = """def a ( x : int = 1 , y : List[str] ) :
   ...:     pass"""

In [3]: red = RedBaron(a)

In [4]: red.help()
0 -----------------------------------------------------
DefNode()
  # identifiers: def, def_, defnode, funcdef, funcdef_
  # default test value: name
  async=False
  name='a'
  decorators ->
  arguments ->
    * DefArgumentNode()
        # identifiers: def_argument, def_argument_, defargument, defargumentnode
        target ->
          TypedNameNode() ...
        value ->
          IntNode() ...
    * DefArgumentNode()
        # identifiers: def_argument, def_argument_, defargument, defargumentnode
        target ->
          TypedNameNode() ...
        value ->
          None
  value ->
    * PassNode()
        # identifiers: pass, pass_, passnode

In [5]: red[0].arguments[0].target.help()
TypedNameNode()
  # identifiers: typed_name, typed_name_, typedname, typednamenode
  value='x'
  annotation ->
    NameNode()
      # identifiers: name, name_, namenode
      value='int'

[Psycojoker]

Checked it and no, no tests are needed since those are classical attributes for this node no additional work is needed, thx!