Bump waitress from 1.0.1 to 1.4.2

Bumps [waitress](https://github.com/Pylons/waitress) from 1.0.1 to 1.4.2.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](Pylons/waitress@v1.0.1...v1.4.2)

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

requirements.txt

@@ -12,7 +12,7 @@ patterns==0.3
 psycopg2==2.7.1
 six==1.10.0
 sqlparse==0.2.2
-waitress==1.0.1
+waitress==1.4.2
 WebOb==1.6.2
 WebTest==2.0.23
 requests==2.20.0