Updated macOS tested Pillow versions [ci skip]

Author: radarhere

docs/installation.rst

@@ -437,6 +437,8 @@ These platforms have been reported to work at the versions mentioned.
 +----------------------------------+------------------------------+--------------------------------+-----------------------+
 |**Operating system**              |**Tested Python versions**    |**Latest tested Pillow version**|**Tested processors**  |
 +----------------------------------+------------------------------+--------------------------------+-----------------------+
+| macOS 10.15 Catalina             | 3.5, 3.6, 3.7, 3.8           | 7.0.0                          |x86-64                 |
++----------------------------------+------------------------------+--------------------------------+-----------------------+
 | macOS 10.14 Mojave               | 2.7, 3.5, 3.6, 3.7           | 6.0.0                          |x86-64                 |
 |                                  +------------------------------+--------------------------------+                       +
 |                                  | 3.4                          | 5.4.1                          |                       |