Update to work with latest TVMaze

[ukharley]

at about line 38:

maze_show = None

tvm = pytvmaze.TVMaze()         <-- add this

try: 
                            V-- and change this
    maze_show = tvm.get_show(show_name=showname, show_year=year, show_country=country)
except Exception as e:
    log.debug('tvmaze: exception: {}'.format(e))

[brookesy2]

@ukharley I added this to the same experimental branch https://github.com/brookesy2/pynab/tree/omdbtmdb