update examples

[iapicca]

• [yak_utils] implemnt and test LetX and LetAsyncX
• [yak_utils] fix Cache
• [yak_utils] fix Cache (1)
• [yak_result] move thenRun extension
• [yak_runner] implement and test letRun and thenRun
• [yak_runner] update pubspec and changelog
• [yak_runner] add forEachRun
• [yak_utils] remove letAsync (it is just 'then')
• [yak_runner] bugfix for VoidResultThenRunX
• [yak_utils] bugfix for LetX
• [yak_result] rework extensions
• [yak_runner] rework extensions
• [yak_runner] fix extension test for thenRun
• bump version in changelog
• update examples

[codecov[bot]]

Codecov Report

Merging #221 (09fb56c) into master (c49cd94) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #221   +/-   ##
=======================================
  Coverage   94.02%   94.02%           
=======================================
  Files          70       70           
  Lines         653      653           
=======================================
  Hits          614      614           
  Misses         39       39           

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