Update deps, add python 3.11 (#311)

* Update deps, add python 3.11

* Try importing the python 3.11 toml lib

.github/workflows/verify.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.7", "3.8", "3.9", "3.10" ]
+        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
       - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."

diff_cover/config_parser.py

@@ -2,12 +2,20 @@
 import enum
 
 try:
-    import tomli
+    import tomli as toml
 
     _HAS_TOML = True
 except ImportError:  # pragma: no cover
     _HAS_TOML = False
 
+if not _HAS_TOML:
+    try:
+        import tomllib as toml
+
+        _HAS_TOML = True
+    except ImportError:  # pragma: no cover
+        pass
+
 
 class Tool(enum.Enum):
     DIFF_COVER = enum.auto()
@@ -38,10 +46,10 @@ def parse(self):
             return None
 
         if not _HAS_TOML:
-            raise ParserError("tomli is not installed")
+            raise ParserError("No Toml lib installed")
 
         with open(self._file_name, "rb") as file_handle:
-            config = tomli.load(file_handle)
+            config = toml.load(file_handle)
 
         config = config.get("tool", {}).get(self._section, {})
         if not config: