v2.2.0 - Update method

• Added update method. See #4
• PHP 8 only

Full Changelog: v2.1.0...v2.2.0

v2.1.0 - DotKey::onCopy()

Added DotKey::onCopy() which makes a copy of the subject.
Objects that would be modified will be cloned in the copy.

v2.0.0 - Welcome to the new Decennium

Complete rewrite, using loops instead of recursion.
PHP 7.4+

Fix for setValue

Merge pull request #2 from jasny/setvalue-traversable

Handle Traversable in setValue

Fix for get value

Merge pull request #1 from sven4ask/master

small fix in get value