Invalid requirement: '–r'Traceback (most recent call last):  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/packaging/requirements.py", line 92, in __init__    req = REQUIREMENT.parseString(requirement_string)  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1617, in parseString    raise exc  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1607, in parseString    loc, tokens = self._parse( instring, 0 )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache    loc,tokens = self.parseImpl( instring, preloc, doActions )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 3376, in parseImpl    loc, exprtokens = e._parse( instring, loc, doActions )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache    loc,tokens = self.parseImpl( instring, preloc, doActions )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 3698, in parseImpl    return self.expr._parse( instring, loc, doActions, callPreParse=False )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache    loc,tokens = self.parseImpl( instring, preloc, doActions )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 3359, in parseImpl    loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 1383, in _parseNoCache    loc,tokens = self.parseImpl( instring, preloc, doActions )  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/pyparsing.py", line 2670, in parseImpl    raise ParseException(instring, loc, self.errmsg, self)pip._vendor.pyparsing.ParseException: Expected W:(abcd...) (at char 0), (line:1, col:1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/req/req_install.py", line 82, in __init__    req = Requirement(req)  File "/home/dev/.pyenv/versions/3.6.1/envs/env361/lib/python3.6/site-packages/pip/_vendor/packaging/requirements.py", line 96, in __init__    requirement_string[e.loc:e.loc + 8]))pip._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'–r'"

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