Fix CI (#1774)

Signed-off-by: Bernát Gábor <[email protected]>

.pre-commit-config.yaml

@@ -33,7 +33,7 @@ repos:
     hooks:
       - id: blacken-docs
         additional_dependencies:
-          - black==19.10b0
+          - black==20.8b1
         language_version: python3.8
   - repo: https://github.com/asottile/add-trailing-comma
     rev: v2.0.2
@@ -55,7 +55,7 @@ repos:
     hooks:
       - id: flake8
         additional_dependencies:
-          - flake8-bugbear == 20.1.2
+          - flake8-bugbear == 20.11.1
         language_version: python3.8
   - repo: local
     hooks:

src/tox/config/__init__.py

@@ -21,6 +21,7 @@
 import toml
 from packaging import requirements
 from packaging.utils import canonicalize_name
+from packaging.version import Version
 
 import tox
 from tox.constants import INFO
@@ -1297,7 +1298,7 @@ def handle_provision(self, config, reader):
         requires_list = reader.getlist("requires")
         config.minversion = reader.getstring("minversion", None)
         config.provision_tox_env = name = reader.getstring("provision_tox_env", ".tox")
-        min_version = "tox >= {}".format(config.minversion or tox.__version__)
+        min_version = "tox >= {}".format(config.minversion or Version(tox.__version__).public)
         deps = self.ensure_requires_satisfied(config, requires_list, min_version)
         if config.run_provision:
             section_name = "testenv:{}".format(name)