Update pillow to 5.2.0

[pyup-bot]

This PR updates pillow from 5.1.0 to 5.2.0.

Changelog

5.2.0

------------------

- Fixed saving a multiframe image as a single frame PDF 3137
[radarhere]

- If a Qt version is already imported, attempt to use it first 3143
[radarhere]

- Fix transform fill color for alpha images 3147
[fozcode]

- TGA: Add support for writing RLE data 3186
[danpla]

- TGA: Read and write LA data 3178
[danpla]

- QuantOctree.c: Remove erroneous attempt to average over an empty range 3196
[tkoeppe]

- Changed ICNS format tests to pass on OS X 10.11 3202
[radarhere]

- Fixed bug in ImageDraw.multiline_textsize() 3114
[tianyu139]

- Added getsize_multiline support for PIL.ImageFont 3113
[tianyu139]

- Added ImageFile get_format_mimetype method 3190
[radarhere]

- Changed mmap file pointer to use context manager 3216
[radarhere]

- Changed ellipse point calculations to be more evenly distributed 3142
[radarhere]

- Only extract first Exif segment 2946
[hugovk]

- Tests: Test ImageDraw2, WalImageFile 3135, 2989
[hugovk]

- Remove unnecessary 'if 0' code 3075
[hugovk]

- Tests: Added GD tests 1817
[radarhere]

- Fix collections ABCs DeprecationWarning in Python 3.7 3123
[hugovk]

- unpack_from is faster than unpack of slice 3201
[landfillbaby]

- Docs: Add coordinate system links and file handling links in documentation 3204, 3214
[radarhere]

- Tests: TestFilePng: Fix test_save_l_transparency() 3182
[danpla]

- Docs: Correct argument name 3171
[radarhere]

- Docs: Update CMake download URL 3166
[radarhere]

- Docs: Improve Image.transform documentation 3164
[radarhere]

- Fix transform fillcolor argument when image mode is RGBA or LA 3163
[radarhere]

- Tests: More specific Exception testing 3158
[radarhere]

- Add getrgb HSB/HSV color strings 3148
[radarhere]

- Allow float values in getrgb HSL color string 3146
[radarhere]

- AppVeyor: Upgrade to Python 2.7.15 and 3.4.4 3140
[radarhere]

- AppVeyor: Upgrade to PyPy 6.0.0 3133
[hugovk]

- Deprecate PILLOW_VERSION and VERSION 3090
[hugovk]

- Support Python 3.7 3076
[hugovk]

- Depends: Update freetype to 2.9.1, libjpeg to 9c, libwebp to 1.0.0 3121, 3136, 3108
[radarhere]

- Build macOS wheels with Xcode 6.4, supporting older macOS versions 3068
[wiredfool]

- Fix _i2f compilation on some GCC versions 3067
[homm]

- Changed encoderinfo to have priority over info when saving GIF images 3086
[radarhere]

- Rename PIL.version to PIL._version and remove it from module 3083
[homm]

- Enable background colour parameter on rotate 3057
[storesource]

- Remove unnecessary `if 1` directive 3072
[jdufresne]

- Remove unused Python class, Path 3070
[jdufresne]

- Fix dereferencing type-punned pointer will break strict-aliasing 3069
[jdufresne]

Links

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

[coveralls]

Coverage remained the same at 70.327% when pulling c04556c on pyup-update-pillow-5.1.0-to-5.2.0 into 103198e on master.