Changelog for 3.5.1

Fix wrong class name in readme.

Changelog for 3.4.1 (#154)

changelog for 3.4.0 (#147)

update readme with example of unadressable ranges

Changelog for 3.2.0

Fix Packet::isCompleteLengthRTU to differentiate fix sized response p…

…ackets from variable size function code responses

Update readme about RTU related changes

Update Github CI flow to run on PRs (#120)

* Update Github CI flow to run on PRs

* Update Github CI flow to run on PRs

Update readme with minimum PHP version info