Drop Python 2 support

[duckduckgrayduck]

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[duckduckgrayduck]

Will close #10 and get us one step closer to running black & pylint on commits and PRs

[duckduckgrayduck]

This is where we are at with Pylint:

************* Module documentcloud.addon
documentcloud/addon.py:27:8: E1111: Assigning result of a function call, where the function has no return (assignment-from-no-return)
documentcloud/addon.py:27:8: W0612: Unused variable 'client' (unused-variable)
documentcloud/addon.py:68:34: C0209: Formatting a regular string which could be an f-string (consider-using-f-string)
documentcloud/addon.py:122:17: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
documentcloud/addon.py:178:19: W3101: Missing timeout argument for method 'requests.put' can cause your program to hang indefinitely (missing-timeout)
documentcloud/addon.py:202:4: R1710: Either all return statements in a function should return an expression, or none of them should. (inconsistent-return-statements)
************* Module documentcloud.documents
documentcloud/documents.py:190:0: C0301: Line too long (93/88) (line-too-long)
documentcloud/documents.py:378:0: C0301: Line too long (89/88) (line-too-long)
documentcloud/documents.py:65:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/documents.py:280:18: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
documentcloud/documents.py:372:4: R0914: Too many local variables (18/15) (too-many-locals)
documentcloud/documents.py:396:8: W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
documentcloud/documents.py:408:12: W1201: Use lazy % formatting in logging functions (logging-not-lazy)
documentcloud/documents.py:432:20: W1201: Use lazy % formatting in logging functions (logging-not-lazy)
documentcloud/documents.py:445:16: W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
documentcloud/documents.py:448:34: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
documentcloud/documents.py:453:24: W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
documentcloud/documents.py:467:20: W1201: Use lazy % formatting in logging functions (logging-not-lazy)
documentcloud/documents.py:372:4: R0912: Too many branches (14/12) (too-many-branches)
documentcloud/documents.py:492:24: W1202: Use lazy % formatting in logging functions (logging-format-interpolation)
documentcloud/documents.py:512:20: W1201: Use lazy % formatting in logging functions (logging-not-lazy)
************* Module documentcloud.exceptions
documentcloud/exceptions.py:19:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
************* Module documentcloud.base
documentcloud/base.py:102:12: C0209: Formatting a regular string which could be an f-string (consider-using-f-string)
documentcloud/base.py:123:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/base.py:172:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/base.py:194:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/base.py:203:12: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/base.py:216:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
************* Module documentcloud.client
documentcloud/client.py:129:8: W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
documentcloud/client.py:145:8: W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
documentcloud/client.py:172:16: W0707: Consider explicitly re-raising using 'raise DoesNotExistError(response=exc.response) from exc' (raise-missing-from)
documentcloud/client.py:174:16: W0707: Consider explicitly re-raising using 'raise APIError(response=exc.response) from exc' (raise-missing-from)
************* Module documentcloud.toolbox
documentcloud/toolbox.py:9:0: C0411: standard import "from urllib.parse import urlparse" should be placed before "import requests" (wrong-import-order)
documentcloud/toolbox.py:10:0: C0411: standard import "from itertools import zip_longest" should be placed before "import requests" (wrong-import-order)
************* Module documentcloud.projects
documentcloud/projects.py:17:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/projects.py:26:8: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)
documentcloud/projects.py:102:4: W0237: Parameter 'id_' has been renamed to 'id' in overriding 'ProjectClient.get' method (arguments-renamed)
documentcloud/projects.py:102:4: W0237: Parameter 'expand' has been renamed to 'title' in overriding 'ProjectClient.get' method (arguments-renamed)
documentcloud/projects.py:118:15: R1725: Consider using Python 3 style super() without arguments (super-with-arguments)

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