Pre-commit-hooks

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- New hook: `mixed-line-ending`

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- Report full python version in `check-ast`.
- Apply a more strict regular expression for `name-tests-test`
- Upgrade binding for `git-lfs` for `check-added-large-files`. The oldest
version that is supported is 2.2.1 (2.2.0 will incorrectly refer to all
files as "lfs" (false negative) and earlier versions will crash.
- `debug-statements` now works for non-utf-8 files.

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- Add `check-executables-have-shebangs` hook.

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- Add `sort-simple-yaml` hook
- Fix `requirements-txt-fixer` for empty files
- Add `file-contents-sorter` hook for sorting flat files
- `check-merge-conflict` now recognizes rebase conflicts
- Metadata now uses `types` (and therefore requires pre-commit 0.15.0). This
allows the text processing hooks to match *all* text files (and to match
files which would only be classifiable by their shebangs).

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- Add flag allowing missing keys to `detect-aws-credentials`
- Handle django default `tests.py` in `name-tests-test`
- Add `--no-ensure-ascii` option to `pretty-format-json`
- Add `no-commit-to-branch` hook

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- Don't false positive on files where trailing whitespace isn't changed.