Add prefix for EIP-191 signature before hashing

[PhABC]

Allows Sequence wallet to login on Opensea among other dapps.

[codecov-commenter]

Codecov Report

Merging #249 (066edc2) into master (56030e9) will decrease coverage by 0.63%. The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
- Coverage   38.46%   37.83%   -0.64%     
==========================================
  Files         131      131              
  Lines        4854     4824      -30     
  Branches     1015     1008       -7     
==========================================
- Hits         1867     1825      -42     
- Misses       2731     2746      +15     
+ Partials      256      253       -3     

Impacted Files	Coverage Δ
packages/provider/src/utils.ts	34.92% <0.00%> (ø)
packages/provider/src/utils/index.ts	13.88% <0.00%> (ø)
packages/wallet/src/utils.ts	35.29% <ø> (ø)
packages/wallet/src/wallet.ts	62.50% <75.00%> (-0.74%)	:arrow_down:
packages/utils/src/digest.ts	100.00% <100.00%> (+33.33%)	:arrow_up:
...ges/multicall/src/providers/provider-middleware.ts	42.85% <0.00%> (-28.58%)	:arrow_down:
packages/multicall/src/multicall.ts	47.14% <0.00%> (-12.36%)	:arrow_down:
packages/multicall/src/utils.ts	34.61% <0.00%> (-11.54%)	:arrow_down:
...kages/multicall/src/providers/external-provider.ts	41.17% <0.00%> (-11.00%)	:arrow_down:
packages/multicall/src/providers/provider.ts	72.34% <0.00%> (-3.53%)	:arrow_down:
... and 2 more

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