Release 1.0.3

• Added base exception SingletonException

Full Changelog: 1.0.2...1.0.3

Release 1.0.2

• Removed Already from method names

Full Changelog: 1.0.1...1.0.2

Release 1.0.1

• Made $instance nullable

Full Changelog: 1.0.0...1.0.1

Release 1.0.0

Full Changelog: https://github.com/okapi-web/php-singleton/commits/1.0.0