Support TOML v1.0.0 syntax in pyproject.toml

fixes nedbat#1180

Author: graingert

coverage/tomlconfig.py

@@ -12,9 +12,9 @@
 
 # TOML support is an install-time extra option.
 try:
-    import toml
+    import tomli
 except ImportError:         # pragma: not covered
-    toml = None
+    tomli = None
 
 
 class TomlDecodeError(Exception):
@@ -44,11 +44,11 @@ def read(self, filenames):
                 toml_text = fp.read()
         except OSError:
             return []
-        if toml:
+        if tomli is not None:
             toml_text = substitute_variables(toml_text, os.environ)
             try:
-                self.data = toml.loads(toml_text)
-            except toml.TomlDecodeError as err:
+                self.data = tomli.loads(toml_text)
+            except tomli.TomlDecodeError as err:
                 raise TomlDecodeError(*err.args)
             return [filename]
         else: