Bump pillow from 4.3.0 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 4.3.0 to 6.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@4.3.0...6.2.0)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.in

@@ -4,7 +4,7 @@ werkzeug >= 0.11.4
 # JPEG-compressed TIFFs.
 #
 # See https://github.com/loris-imageserver/loris/issues/405
-pillow >= 2.4.0, <5.0
+pillow >= 2.4.0, < 7.0
 
 configobj >= 4.7.2,<=5.0.0
 requests >= 2.12.0

requirements.txt

@@ -13,8 +13,7 @@ configobj==5.0.0
 cryptography==2.3
 idna==2.6                 # via cryptography, requests
 netaddr==0.7.19
-olefile==0.45.1           # via pillow
-pillow==4.3.0
+pillow==6.2.0
 pycparser==2.18           # via cffi
 pyjwt==1.5.3
 requests==2.20.0

requirements_test.txt

@@ -18,9 +18,8 @@ idna==2.6
 mccabe==0.6.1             # via flake8
 mock==2.0.0               # via responses
 netaddr==0.7.19
-olefile==0.45.1
 pbr==3.1.1                # via mock
-pillow==4.3.0
+pillow==6.2.0
 py==1.5.2                 # via pytest
 pycodestyle==2.3.1        # via flake8
 pycparser==2.18