Python 3.7: DeprecationWarning from collections

Seeing warnings when importing responses in Python 3.7:

DeprecationWarning: Using or importing the ABCs from ‘collections’ instead of from ‘collections.abc’ is deprecated, and in 3.8 it will stop working from collections import namedtuple, Sequence, Sized

A cookies deprecation warning is shown as well, it has been reported earlier in https://github.com/getsentry/responses/issues/186.

Steps to reproduce

Create file test_responses.py:

import warnings
warnings.filterwarnings(module='.*', action='default')
import responses

With Python 3.7 execute the file and notice the output:

$ python -V
Python 3.7.0
$ python tests/test_responses.py
/Users/kristofferb/.testvenv/py37responses/lib/python3.7/site-packages/responses.py:11: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  from collections import namedtuple, Sequence, Sized
/Users/kristofferb/.testvenv/py37responses/lib/python3.7/site-packages/cookies.py:312: DeprecationWarning: Flags not at the start of the expression '(?ix)  # Case-insens' (truncated)
  ATTR_RE = re.compile(ATTR)

[adamchainz]

The formatargspec warning still occurs on Python 3.7 for me, I’m working on a PR rn.

[bcb]

Also seeing these in 3.7:

/Users/beau/personal/jsonrpcclient/.tox/py37/lib/python3.7/site-packages/responses.py:117: DeprecationWarning: `formatargspec` is deprecated since Python 3.5. Use `signature` and the `Signature` object directly
  signature = inspect.formatargspec(args, a, kw, defaults)

/Users/beau/personal/jsonrpcclient/.tox/py37/lib/python3.7/site-packages/responses.py:121: DeprecationWarning: `formatargspec` is deprecated since Python 3.5. Use `signature` and the `Signature` object directly
  callargs = inspect.formatargspec(args, a, kw, None)

/Users/beau/personal/jsonrpcclient/.tox/py37/lib/python3.7/site-packages/responses.py:117: DeprecationWarning: `formatargspec` is deprecated since Python 3.5. Use `signature` and the `Signature` object directly
  signature = inspect.formatargspec(args, a, kw, defaults)

/Users/beau/personal/jsonrpcclient/.tox/py37/lib/python3.7/site-packages/responses.py:121: DeprecationWarning: `formatargspec` is deprecated since Python 3.5. Use `signature` and the `Signature` object directly
  callargs = inspect.formatargspec(args, a, kw, None)