Bump fonttools from 4.2.2 to 4.2.4

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.2.2 to 4.2.4.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/master/NEWS.rst)
- [Commits](fonttools/fonttools@4.2.2...4.2.4)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -11,7 +11,7 @@ async-timeout==3.0.1      # via aiohttp
 attrs==19.3.0             # via aiohttp
 cffi==1.13.2              # via pycares
 chardet==3.0.4            # via aiohttp
-fonttools==4.2.2
+fonttools==4.2.4
 idna==2.8                 # via yarl
 multidict==4.7.3          # via aiohttp, yarl
 pycares==3.1.0            # via aiodns