Capitalized Types not handled properly

[Bhargavasomu]

What was wrong?

If the type is given as capital letter, then the code is not working (some grammar error). Please see the following code.

from eth_abi.grammar import parse
obj = parse("person[2]")
obj1 = parse("Person[2]")
---------------------------------------------------------------------------
ParseError                                Traceback (most recent call last)
~/ethereum/eth-account/venv/lib/python3.6/site-packages/eth_abi/grammar.py in parse(self, type_str)
    122         try:
--> 123             return super().parse(type_str)
    124         except parsimonious.ParseError as e:

~/ethereum/eth-account/venv/lib/python3.6/site-packages/parsimonious/nodes.py in parse(self, text, pos)
    253         """
--> 254         return self._parse_or_match(text, pos, 'parse')
    255 

~/ethereum/eth-account/venv/lib/python3.6/site-packages/parsimonious/nodes.py in _parse_or_match(self, text, pos, method_name)
    288                     method=method_name))
--> 289         return self.visit(getattr(self.grammar, method_name)(text, pos=pos))
    290 

~/ethereum/eth-account/venv/lib/python3.6/site-packages/parsimonious/grammar.py in parse(self, text, pos)
    114         self._check_default_rule()
--> 115         return self.default_rule.parse(text, pos=pos)
    116 

~/ethereum/eth-account/venv/lib/python3.6/site-packages/parsimonious/expressions.py in parse(self, text, pos)
    119         """
--> 120         node = self.match(text, pos=pos)
    121         if node.end < len(text):

~/ethereum/eth-account/venv/lib/python3.6/site-packages/parsimonious/expressions.py in match(self, text, pos)
    136         if node is None:
--> 137             raise error
    138         return node

ParseError: Rule 'type' didn't match at 'Person[]' (line 1, column 1).

During handling of the above exception, another exception occurred:

ParseError                                Traceback (most recent call last)
<ipython-input-6-ed74617bc5cf> in <module>
----> 1 obj = parse("Person[]")

~/ethereum/eth-account/venv/lib/python3.6/site-packages/eth_abi/grammar.py in parse(self, type_str)
    123             return super().parse(type_str)
    124         except parsimonious.ParseError as e:
--> 125             raise ParseError(e.text, e.pos, e.expr)
    126 
    127 

How can it be fixed?

Fill this section in if you know how this could or should be fixed.

[Bhargavasomu]

cc @pipermerriam @davesque

[davesque]

Made the above PR to address this. Thanks for pointing it out.

[davesque]

I can cut a new beta release once we get this sorted out.