fix bug in bulk_update, update documentation, update readme, bump version

docs_src/models/docs008.py

@@ -0,0 +1,19 @@
+import databases
+import sqlalchemy
+
+import ormar
+
+database = databases.Database("sqlite:///test.db", force_rollback=True)
+metadata = sqlalchemy.MetaData()
+
+
+class Child(ormar.Model):
+    class Meta:
+        tablename = "children"
+        metadata = metadata
+        database = database
+
+    id: ormar.Integer(name='child_id', primary_key=True)
+    first_name: ormar.String(name='fname', max_length=100)
+    last_name: ormar.String(name='lname', max_length=100)
+    born_year: ormar.Integer(name='year_born', nullable=True)