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

docs_src/models/docs010.py

@@ -0,0 +1,18 @@
+class ArtistChildren(ormar.Model):
+    class Meta:
+        tablename = "children_x_artists"
+        metadata = metadata
+        database = database
+
+
+class Artist(ormar.Model):
+    class Meta:
+        tablename = "artists"
+        metadata = metadata
+        database = database
+
+    id: ormar.Integer(name='artist_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')
+    children: ormar.ManyToMany(Child, through=ArtistChildren)