Add Avocado (AVO) token

[peter-evans]

Description

Adds Avocado token with symbol AVO.
https://etherscan.io/address/0xfa6f7881e52fdf912c4a285d78a3141b089ce859

About Avocado Token
On March 1st, 2018, 9000 CryptoKitties players were chosen at random to receive an airdrop of 100m AVO tokens each. The reasoning for this was because CK players were recognized as creative, innovative, and positive users of crypto. This action has been dubbed the world's first reverse-ICO, bringing people together for the purpose of community and collaboration.

The community are now working together to build and create uses for AVO and we would like to use gitcoin to offer AVO token incentives for various projects.

Checklist

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

Affected core subsystem(s)

• dashboard
• crypto

Testing

Refers/Fixes

[codecov]

Codecov Report

Merging #1116 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1116      +/-   ##
==========================================
- Coverage    31.7%   31.66%   -0.05%     
==========================================
  Files         105      105              
  Lines        7352     7352              
  Branches      970      970              
==========================================
- Hits         2331     2328       -3     
- Misses       4912     4915       +3     
  Partials      109      109

Impacted Files	Coverage Δ
app/dashboard/tokens.py	100% <ø> (ø)	⬆️
app/app/settings.py	80.79% <0%> (-1.99%)	⬇️

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[owocki]

looks fine

[peter-evans]

Thank you!