Bug fix of the NameError where token_entries is not defined

[Leolty]

This PR fixes #824.

Description of changes

Add one line to define the token_entries:

token_entries = input_pack.get(Token)

Possible influences of this PR.

Little change in README.md

Test Conducted

With this change, the python code in Quick Start Guide is runnable.

[hepengfe]

You could remove square brackets around the issue link.

[codecov]

Codecov Report

Merging #825 (0e380cc) into master (9711823) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #825   +/-   ##
=======================================
  Coverage   80.50%   80.50%           
=======================================
  Files         252      252           
  Lines       19363    19363           
=======================================
  Hits        15588    15588           
  Misses       3775     3775           

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[Leolty]

You could remove square brackets around the issue link.

square brackets have been removed