Hyphen in node value causes exception

[Hawken Rives]

Python version: 3.6.13
kdl-py: 0.1.5

I had to apply the patch from #2, as well.

// data.kdl
kdl.parse('''
s3-upload {
	bucket "data-output"  
}
''')

$ python3 -c 'import kdl; data = open("./data.kdl", "r").read(); print(kdl.parse(data));'
Traceback (most recent call last):
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 218, in parse
    result = rule()
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 56, in wrapper
    return self._call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 519, in _call
    result = self._recursive_call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 548, in _recursive_call
    return self._invoke_rule(ruleinfo, self.memokey)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 595, in _invoke_rule
    ruleinfo.impl(self)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/grammar.py", line 95, in _start_
    self._check_eof()
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 664, in _check_eof
    self._error('Expecting end of text', exclass=FailedExpectingEndOfText)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 453, in _error
    raise self._make_exception(item, exclass=exclass)
tatsu.exceptions.FailedExpectingEndOfText: (1:1) Expecting end of text :
s3-upload {
^
start

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/parser.py", line 225, in parse
    parser = Parser(document, preserve_property_order, symbols_as_strings, dlist)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/parser.py", line 140, in __init__
    ast = model.parse(document)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 226, in parse
    raise self._furthest_exception
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 694, in _option
    yield
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/grammar.py", line 197, in _node_space_
    self._escline_()
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 56, in wrapper
    return self._call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 519, in _call
    result = self._recursive_call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 548, in _recursive_call
    return self._invoke_rule(ruleinfo, self.memokey)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 586, in _invoke_rule
    raise memo
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 694, in _option
    yield
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/grammar.py", line 197, in _node_space_
    self._escline_()
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 56, in wrapper
    return self._call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 519, in _call
    result = self._recursive_call(ruleinfo)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 548, in _recursive_call
    return self._invoke_rule(ruleinfo, self.memokey)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 595, in _invoke_rule
    ruleinfo.impl(self)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/kdl/grammar.py", line 471, in _escline_
    self._token('\\')
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 632, in _token
    self._error(token, exclass=FailedToken)
  File "/Users/rives/Git/python-dl/venv/lib/python3.6/site-packages/tatsu/contexts.py", line 453, in _error
    raise self._make_exception(item, exclass=exclass)
tatsu.exceptions.FailedToken: (2:24) expecting '\\' :
        bucket "data-output"
                            ^
escline
node_space
node
nodes
node_children
node
nodes
start

Please let me know if you need anything else!