add write_flush in tflogger, fix argument passing in wandblogger

[Trinkle23897]

close #580

[Trinkle23897]

@vwxyzjn this is a bug fix #558

[codecov-commenter]

Codecov Report

Merging #581 (03e932b) into master (6ab9860) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 03e932b differs from pull request most recent head 7f9e973. Consider uploading reports for the commit 7f9e973 to get more accurate results

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
- Coverage   93.51%   93.45%   -0.07%     
==========================================
  Files          66       66              
  Lines        4429     4429              
==========================================
- Hits         4142     4139       -3     
- Misses        287      290       +3     

Flag	Coverage Δ
unittests	93.45% <100.00%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tianshou/utils/logger/tensorboard.py	75.00% <100.00%> (+1.19%)	⬆️
tianshou/utils/logger/wandb.py	52.83% <100.00%> (+0.90%)	⬆️
tianshou/policy/modelfree/trpo.py	88.52% <0.00%> (-4.92%)	⬇️
tianshou/data/collector.py	93.77% <0.00%> (-0.05%)	⬇️
tianshou/env/worker/subproc.py	94.03% <0.00%> (-0.04%)	⬇️

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