V5 Release

[aweakley]

Related issues:

• [x] #50 performance improvement and tests
• [x] #42 merge fork
• [x] #43 add CI process
• [x] #49 linting
• [x] #53 coverage

[ColeDCrawford]

• Closes #41
• Closes #32
• Closes #29
• Closes #24
• Closes #12
• Closes #11 (I think packrat is enough for this?) and closes PR #36
• Closes #3
• Closes #30:

  >>> from edtf import parse_edtf
  >>> parse_edtf("Vodka")
  Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/colecrawford/GitHub/python-edtf/edtf/parser/grammar.py", line 360, in parse_edtf
  raise EDTFParseException(input_string, err) from None
  edtf.parser.edtf_exceptions.EDTFParseException: Error at position 0: Invalid input or format near 'Vodka'. Please provide a valid EDTF string.

• Closes #35:

  >>> parse_edtf("576")
  Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/colecrawford/GitHub/python-edtf/edtf/parser/grammar.py", line 360, in parse_edtf
  raise EDTFParseException(input_string, err) from None
  edtf.parser.edtf_exceptions.EDTFParseException: Error at position 3: Invalid input or format near '576'. Please provide a valid EDTF string.

• Closes #38:

  >>> parsed_natural = text_to_edtf('circa 17th century')
  >>> parsed_natural
  '16XX~'
  >>> parse_edtf(parsed_natural)
  Unspecified: '16XX~'

• Closes #31

Issues to tackle still:

• [ ] #52