Add ProxyJump option

[Tr4sK]

Hey, I’m using a lot that option to jump into lan and restricted area.

~ % concierge-check 
/usr/lib/python3.7/site-packages/markupsafe/__init__.py:13: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  from collections import Mapping
/usr/lib/python3.7/site-packages/jinja2/utils.py:485: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  from collections import MutableMapping
/usr/lib/python3.7/site-packages/concierge/endpoints/common.py:31: FutureWarning: --use-templater flag and therefore implicit templater autoresolve are deprecated. Please use explicit templater in both concierge-check and concierge.
  FutureWarning)
Cannot parse content of source file /home/tr4sk/.conciergerc: Unknown option ProxyJump
Failed with error Unknown option ProxyJump
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/concierge/endpoints/common.py", line 163, in main_func
    return app.do()
  File "/usr/lib/python3.7/site-packages/concierge/endpoints/check.py", line 14, in do
    return self.output()
  File "/usr/lib/python3.7/site-packages/concierge/endpoints/common.py", line 71, in output
    content = self.get_new_config()
  File "/usr/lib/python3.7/site-packages/concierge/endpoints/common.py", line 94, in get_new_config
    content = self.process_syntax(content)
  File "/usr/lib/python3.7/site-packages/concierge/endpoints/common.py", line 135, in process_syntax
    return concierge.core.processor.process(content)
  File "/usr/lib/python3.7/site-packages/concierge/core/processor.py", line 11, in process
    content = concierge.core.parser.parse(content)
  File "/usr/lib/python3.7/site-packages/concierge/core/parser.py", line 164, in parse
    root_host = parse_options(root_host, tokens)
  File "/usr/lib/python3.7/site-packages/concierge/core/parser.py", line 194, in parse_options
    parse_options(host, host_tokens)
  File "/usr/lib/python3.7/site-packages/concierge/core/parser.py", line 203, in parse_options
    raise exceptions.ParserUnknownOption(token.option)
concierge.core.exceptions.ParserUnknownOption: Unknown option ProxyJump