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 :white_check_mark:

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

```diff @@ 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