[N04] MockReserve.sol has mintToken function

[asaj]

Description

The MockReserve contract has a mintToken function, while the contract it is based on, Reserve, does not.

Related issues

• Fixes https://github.com/celo-org/celo-labs/issues/439

[codecov]

Codecov Report

Merging #3281 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3281   +/-   ##
=======================================
  Coverage   75.91%   75.91%           
=======================================
  Files         614      614           
  Lines       15366    15366           
  Branches     1909     1835   -74     
=======================================
  Hits        11665    11665           
- Misses       3370     3372    +2     
+ Partials      331      329    -2     

Flag	Coverage Δ
#mobile	75.75% <ø> (ø)
#web	76.11% <ø> (ø)

Impacted Files	Coverage Δ
packages/web/src/utils/utils.ts	79.62% <0.00%> (ø)
packages/web/src/utils/abortableFetch.ts	71.42% <0.00%> (ø)

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[mrsmkl]

LGTM