Resolve Travis failures on dependency conflict

[mbeacom]

Description

The goal of this PR is to resolve #142 by pinning cytoolz to 0.8.2 and resolving an isort error in cleanup_db_space.py file.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

Travis CI

Refers/Fixes

Fixes #142

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e7280bf). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #143   +/-   ##
=========================================
  Coverage          ?   12.28%           
=========================================
  Files             ?       66           
  Lines             ?     3094           
  Branches          ?      343           
=========================================
  Hits              ?      380           
  Misses            ?     2714           
  Partials          ?        0

Impacted Files	Coverage Δ
.../dashboard/management/commands/cleanup_db_space.py	0% <ø> (ø)

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[gitcoinbot]

⚡️ A tip worth 0.05 ETH ($38.33) has been granted to @mbeacom for this issue from Kevin. ⚡️

The sender had the following public comments:

The boy scouts have a rule: Always leave the campground cleaner than you found it. Thanks for being a boy scout!

Nice work @mbeacom, check your email for further instructions.

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