Update pre-commit configuration

Author: Cito

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: git://github.com/pre-commit/pre-commit-hooks
-    rev: v2.1.0
+    rev: v2.4.0
     hooks:
     -   id: check-merge-conflict
     -   id: check-json
@@ -14,16 +14,15 @@ repos:
     -   id: trailing-whitespace
         exclude: README.md
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v1.12.0
+    rev: v1.26.2
     hooks:
     -   id: pyupgrade
 -   repo: https://github.com/ambv/black
-    rev: 19.3b0
+    rev: 19.10b0
     hooks:
     - id: black
-      language_version: python3.6
 -   repo: https://github.com/pycqa/flake8
-    rev: 3.7.7
+    rev: 3.7.9
     hooks:
     -   id: flake8
         exclude: test_.*$

.travis.yml

@@ -11,8 +11,6 @@ matrix:
        python: 3.6
     -  env: TOXENV=py37
        python: 3.7
-       dist: xenial
-       sudo: true # required workaround for https://github.com/travis-ci/travis-ci/issues/9815
     -  env: TOXENV=pypy2
        python: pypy
     -  env: TOXENV=pypy