Log Message:
py-peewee: updated to 3.8.0

3.8.0

**New features**

* Postgres BinaryJSONField now supports has_key(), concat() and
  remove() methods (though remove may require pg10+).
* Add python_value() method to the SQL-function helper fn, to allow
  specifying a custom function for mapping database values to Python values.

**Changes**

* Better support for UPDATE ... FROM queries, and more generally, more robust
  support for UPDATE and RETURNING clauses. This means that the
  QualifiedNames helper is no longer needed for certain types of queries.
* The SqlCipherDatabase no longer accepts a kdf_iter parameter. To
  configure the various SQLCipher encryption settings, specify the setting
  values as pragmas when initializing the database.
* Introspection will now, by default, only strip "_id" from \ 
introspected column
  names if those columns are foreign-keys.
* Allow UUIDField and BinaryUUIDField to accept hexadecimal UUID strings as
  well as raw binary UUID bytestrings (in addition to UUID instances, which
  are already supported).
* Allow ForeignKeyField to be created without an index.
* Allow multiple calls to cast() to be chained.
* Add logic to ensure foreign-key constraint names that exceed 64 characters
  are truncated using the same logic as is currently in place for long indexes.
* ManyToManyField supports foreign-keys to fields other than primary-keys.
* When linked against SQLite 3.26 or newer, support SQLITE_CONSTRAINT to
  designate invalid queries against virtual tables.
* SQL-generation changes to aid in supporting using queries within expressions
  following the SELECT statement.

**Bugfixes**

* Fixed bug in order_by_extend(), thanks @nhatHero.
* Fixed bug where the DataSet CSV import/export did not support non-ASCII
  characters in Python 3.x.
* Fixed bug where model_to_dict would attempt to traverse explicitly disabled
  foreign-key backrefs.
* Fixed bug when attempting to migrate SQLite tables that have a field whose
  column-name begins with "primary_".
* Fixed bug with inheriting deferred foreign-keys.