add comment about accessing AccessToken

[Uinelj]

This needs more attention but adding a comment in the readme addresses the problem while a better solution is found.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.14%. Comparing base (9faaa4f) to head (e411dfb).
Report is 27 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
- Coverage   87.51%   87.14%   -0.38%     
==========================================
  Files          15       16       +1     
  Lines        1354     1408      +54     
==========================================
+ Hits         1185     1227      +42     
- Misses        125      133       +8     
- Partials       44       48       +4     

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[mattn]

Thank you