Start updating the readme

[withinboredom]

Description

Updates the readme to reflect 1.2 changes.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to
implementation.

Please reference the issue this PR will close: #109

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Tests pass
• Created/updated tests
• Extended the documentation

[codecov-commenter]

Codecov Report

Merging #114 (5f27eda) into main (bf50ad8) will decrease coverage by 0.21%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main     #114      +/-   ##
============================================
- Coverage     76.20%   75.99%   -0.22%     
- Complexity      560      562       +2     
============================================
  Files            68       69       +1     
  Lines          1786     1791       +5     
============================================
  Hits           1361     1361              
- Misses          425      430       +5     

Impacted Files	Coverage Δ
src/lib/Client/StateTransactionRequest.php	0.00% <0.00%> (ø)

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