Bump version to 2.1.1

Bump version to 2.1.0

Bump version to 2.0.3 (support for PHP8)

Rename files

Version 2.0.1 [2016-11-24]

+ Fix $a["123"] (number as a string key) look-ups

Version 2.0.0 [2016-06-23]

+ PHP-NG (PHP7) support

Version 1.2.3

+ Support for previously unsupported AMF3 types
+ Error reporting fixes

Version 1.2.2

+ Minor error reporting fixes

Version 1.2.1

+ Important security fixes
+ Minor fixes (build files, tests, README)

Version 1.2.0

+ Option to force encoding non-dense arrays as anonymous objects.
+ Option to perform automatic class mapping in the decoder.