Remove redundant mypy config 'incremental'

The mypy config 'incremental` has defaulted as true since version 0.590.
Can drop the local override. For details, see:

https://github.com/python/mypy/commit/6b13652a466ccb102987a2ab1fa93d4b52fd8e3f

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 6e28a10fc..c8d24c6f0 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@ extras_require = {
         'html5lib',
         'flake8>=3.5.0',
         'flake8-import-order',
-        'mypy>=0.470',
+        'mypy>=0.590',
         'docutils-stubs',
     ],
 }