add docs, provide check if Config is a class, ignore dynamic bases for mypy

docs_src/models/docs016.py

@@ -0,0 +1,20 @@
+import databases
+import sqlalchemy
+
+import ormar
+
+database = databases.Database("sqlite:///db.sqlite")
+metadata = sqlalchemy.MetaData()
+
+
+class Course(ormar.Model):
+    class Meta:
+        database = database
+        metadata = metadata
+
+    class Config:
+        allow_mutation = False
+
+    id: int = ormar.Integer(primary_key=True)
+    name: str = ormar.String(max_length=100)
+    completed: bool = ormar.Boolean(default=False)