Update README to reflect recent changes and removals

[akarnokd]

Removed mentions of Iterable Extensions and Javadoc bloat revamp.

Posting to trigger trufflehog for 3rd party repos

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (354a02f) to head (a91e0df).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8263      +/-   ##
============================================
+ Coverage     98.57%   98.64%   +0.06%     
+ Complexity     7147     7146       -1     
============================================
  Files           824      824              
  Lines         50768    50768              
  Branches       6905     6905              
============================================
+ Hits          50045    50078      +33     
+ Misses          492      475      -17     
+ Partials        231      215      -16     

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