Release Datasette 0.44

Refs #395, #519, #576, #699, #706, #774, #777, #781, #784, #788, #790, #797,
#798, #800, #802, #804, #819, #822, #825, #826, #827, #828, #829, #830,
#833, #836, #837, #839

Closes #806.

docs/changelog.rst

@@ -6,7 +6,7 @@ Changelog
 
 .. _v0_44:
 
-0.44 (2020-06-??)
+0.44 (2020-06-11)
 -----------------
 
 Authentication and permissions, writable canned queries, flash messages, new plugin hooks and more.