Update pillow to 7.1.0

[pyup-bot]

This PR updates Pillow from 7.0.0 to 7.1.0.

Changelog

### 7.1.0 ``` ------------------ - Fix multiple OOB reads in FLI decoding 4503 [wiredfool] - Fix buffer overflow in SGI-RLE decoding 4504 [wiredfool, hugovk] - Fix bounds overflow in JPEG 2000 decoding 4505 [wiredfool] - Fix bounds overflow in PCX decoding 4506 [wiredfool] - Fix 2 buffer overflows in TIFF decoding 4507 [wiredfool] - Add APNG support 4243 [pmrowla, radarhere, hugovk] - ImageGrab.grab() for Linux with XCB 4260 [nulano, radarhere] - Added three new channel operations 4230 [dwastberg, radarhere] - Prevent masking of Image reduce method in Jpeg2KImagePlugin 4474 [radarhere, homm] - Added reading of earlier ImageMagick PNG EXIF data 4471 [radarhere] - Fixed endian handling for I;16 getextrema 4457 [radarhere] - Release buffer if function returns prematurely 4381 [radarhere] - Add JPEG comment to info dictionary 4455 [radarhere] - Fix size calculation of Image.thumbnail() 4404 [orlnub123] - Fixed stroke on FreeType < 2.9 4401 [radarhere] - If present, only use alpha channel for bounding box 4454 [radarhere] - Warn if an unknown feature is passed to features.check() 4438 [jdufresne] - Fix Name field length when saving IM images 4424 [hugovk, radarhere] - Allow saving of zero quality JPEG images 4440 [radarhere] - Allow explicit zero width to hide outline 4334 [radarhere] - Change ContainerIO return type to match file object mode 4297 [jdufresne, radarhere] - Only draw each polygon pixel once 4333 [radarhere] - Add support for shooting situation Exif IFD tags 4398 [alexagv] - Handle multiple and malformed JPEG APP13 markers 4370 [homm] - Depends: Update libwebp to 1.1.0 4342, libjpeg to 9d 4352 [radarhere] ```

Links

- PyPI: https://pypi.org/project/pillow - Changelog: https://pyup.io/changelogs/pillow/ - Homepage: https://python-pillow.org

[pyup-bot]

Closing this in favor of #633