update random walk so it can be used with multiple users

[jwkvam]

No description provided.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@725fb87). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #126   +/-   ##
=========================================
  Coverage          ?   75.91%           
=========================================
  Files             ?       28           
  Lines             ?     1669           
  Branches          ?        0           
=========================================
  Hits              ?     1267           
  Misses            ?      402           
  Partials          ?        0

Impacted Files	Coverage Δ
bowtie/_cache.py	50% <ø> (ø)
bowtie/_progress.py	72% <ø> (ø)
bowtie/_command.py	21.66% <ø> (ø)
bowtie/tests/test_serialize.py	100% <ø> (ø)
bowtie/visual.py	71.96% <ø> (ø)
bowtie/tests/test_multiple.py	90.47% <ø> (ø)
bowtie/tests/test_editor.py	97.72% <ø> (ø)
bowtie/tests/test_command.py	73.33% <ø> (ø)
bowtie/tests/test_cache.py	83.33% <ø> (ø)
bowtie/tests/test_components.py	96.82% <ø> (ø)
... and 17 more

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