Fix dependency inconsistencies

[xpepermint]

Version inconsistency for the 0xcert/ethereum-utils will be fixed with 1.2.0.

[codecov-io]

Codecov Report

Merging #465 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
- Coverage   86.07%   85.96%   -0.12%     
==========================================
  Files          92       89       -3     
  Lines        1839     1824      -15     
  Branches      212      211       -1     
==========================================
- Hits         1583     1568      -15     
  Misses        190      190              
  Partials       66       66

Impacted Files	Coverage Δ
...0xcert-ethereum-utils/src/lib/normalize-address.ts
...ckages/0xcert-ethereum-utils/src/lib/big-number.ts
packages/0xcert-ethereum-utils/src/lib/abi.ts

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