py-webpy: updated to 0.62

0.62

* Fixed: application.load() assumes ctx.path will be a latin1 string
* Fixed: can not reset session data to same value as initialized.
* Fixed: can not set session expire time.
* Fixed: not export session store `MemoryStore`.

0.61

* setup.py: Add python_requires='>=3.5'

0.60

* Python-2 support has been completely dropped. Welcome to Python 3.
* Fixed: session store `DiskStore` doesn't return correctly if session
  directory doesn't exist.
* Fixed: incorrect str/bytes type of session data.
* Fixed: `db.query("insert... returning")` fails to commit.

(adam)