[Security] Bump pillow from 6.0.0 to 6.2.1

[dependabot-preview]

Bumps pillow from 6.0.0 to 6.2.1.

Release notes

Sourced from pillow's releases.

6.2.1

https://pillow.readthedocs.io/en/stable/releasenotes/6.2.1.html

6.2.0

https://pillow.readthedocs.io/en/stable/releasenotes/6.2.0.html

6.1.0

https://pillow.readthedocs.io/en/stable/releasenotes/6.1.0.html

Changelog

Sourced from pillow's changelog.

6.2.1 (2019-10-20)

• This is the last Pillow release to support Python 2.7 #3642
• Add support for Python 3.8 #4141 [hugovk]

6.2.0 (2019-10-01)

• Catch buffer overruns #4104 [radarhere]
• Initialize rows_per_strip when RowsPerStrip tag is missing #4034 [cgohlke, radarhere]
• Raise error if TIFF dimension is a string #4103 [radarhere]
• Added decompression bomb checks #4102 [radarhere]
• Fix ImageGrab.grab DPI scaling on Windows 10 version 1607+ #4000 [nulano, radarhere]
• Corrected negative seeks #4101 [radarhere]
• Added argument to capture all screens on Windows #3950 [nulano, radarhere]
• Updated warning to specify when Image.frombuffer defaults will change #4086 [radarhere]
• Changed WindowsViewer format to PNG #4080 [radarhere]
• Use TIFF orientation #4063 [radarhere]
• Raise the same error if a truncated image is loaded a second time #3965 [radarhere]
• Lazily use ImageFileDirectory_v1 values from Exif #4031 [radarhere]
• Improved HSV conversion #4004 [radarhere]
• Added text stroking #3978 [radarhere, hugovk]
• No more deprecated bdist_wininst .exe installers #4029 [hugovk]
• Do not allow floodfill to extend into negative coordinates #4017 [radarhere]
• Fixed arc drawing bug for a non-whole number of degrees #4014 [radarhere]
• Fix bug when merging identical images to GIF with a list of durations #4003 [djy0, radarhere]
• Fix bug in TIFF loading of BufferedReader #3998 [chadawagner]
• Added fallback for finding ld on MinGW Cygwin #4019 [radarhere]
• Remove indirect dependencies from requirements.txt #3976 [hugovk]
• Depends: Update libwebp to 1.0.3 #3983, libimagequant to 2.12.5 #3993, freetype to 2.10.1 #3991 [radarhere]
• Change overflow check to use PY_SSIZE_T_MAX #3964 [radarhere]
• Report reason for pytest skips #3942 [hugovk]

6.1.0 (2019-07-01)

• Deprecate Image.__del__ #3929 [jdufresne]
• Tiff: Add support for JPEG quality #3886 [olt]
• Respect the PKG_CONFIG environment variable when building #3928 [chewi]
• Use explicit memcpy() to avoid unaligned memory accesses #3225 [DerDakon]
• Improve encoding of TIFF tags #3861 [olt]
• Update Py_UNICODE to Py_UCS4 #3780 [nulano]
• Consider I;16 pixel size when drawing #3899 [radarhere]
• Add TIFFTAG_SAMPLEFORMAT to blocklist #3926 [cgohlke, radarhere]
• Create GIF deltas from background colour of GIF frames if disposal mode is 2 #3708 [sircinnamon, radarhere]
• Added ImageSequence all_frames #3778 [radarhere]
• Use unsigned int to store TIFF IFD offsets #3923 [cgohlke]
• Include CPPFLAGS when searching for libraries #3819 [jefferyto]
• Updated TIFF tile descriptors to match current decoding functionality #3795 [dmnisson]

... (truncated)

Commits

• 6e0f07b Pillow 6.2.1 is the last to support Python 2.7
• 39d26d3 6.2.1 version bump
• ee9e21a Add release notes for Pillow 6.2.1
• efcfb91 Update CHANGES.rst [CI skip]
• f97c4dd 6.2.x: Add support for Python 3.8 (#4151)
• b78edcc Add support for Python 3.8
• 8a30d13 Updated CHANGES.rst [ci skip]
• 75602d1 6.2.0 version bump
• 4756af9 Updated CHANGES.rst [ci skip]
• cc16025 Merge pull request #4104 from radarhere/overrun
• Additional commits viewable in compare view

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[dependabot-preview]

We've just been alerted that this update fixes a security vulnerability:

Sourced from The GitHub Security Advisory Database.

Low severity vulnerability that affects pillow
An issue was discovered in Pillow before 6.2.0. When reading specially crafted invalid image files, the library can either allocate very large amounts of memory or take an extremely long period of time to process the image.

Affected versions: ["< 6.2.0"]

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