Add Celo to currencies

[pawelnguyen]

This Adds Celo to list of currencies. We're going to need it for the Celo Ledger Live integration

[codecov]

Codecov Report

Merging #723 (e9fbd19) into master (8235c8c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #723   +/-   ##
=======================================
  Coverage   45.22%   45.22%           
=======================================
  Files          82       82           
  Lines        4957     4957           
  Branches      795      795           
=======================================
  Hits         2242     2242           
  Misses       2701     2701           
  Partials       14       14           

Impacted Files	Coverage Δ
packages/cryptoassets/src/currencies.ts	100.00% <ø> (ø)

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