Update the integration sections in README.md

[toshihikoyanase]

Motivation

The current README.md includes integrations for obsolete libraries like allennlp and chainer. Conversely, it lacks entries for several supported libraries.

Description of the changes

• Remove entries for obsolete libraries: allennlp, chainer
• Add entries for newly supported libraries: Dask, MLflow, 'TensorBoard', Weights & Biases

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9fcd5b9) 89.30% compared to head (08003da) 89.31%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5108   +/-   ##
=======================================
  Coverage   89.30%   89.31%           
=======================================
  Files         205      205           
  Lines       15188    15188           
=======================================
+ Hits        13564    13565    +1     
+ Misses       1624     1623    -1     

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[c-bata]

Thank you for your pull request. The changes look good to me. I left one suggestion though.

[c-bata]

LGTM!