Fix warning pwa + publish new version

[gjgd]

fixes #69

[gjgd]

Blocked by trufflesuite/truffle#2488
element-api and element-lib 's truffle dependencies need to be updated when this is merged so that all versions of web3 are 1.2.2 (in this version, the scrypt warning problem is solved)

[codecov-io]

Codecov Report

Merging #98 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   33.39%   33.39%           
=======================================
  Files         242      242           
  Lines        3159     3159           
  Branches      228      228           
=======================================
  Hits         1055     1055           
  Misses       1988     1988           
  Partials      116      116

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d96efdc...b9172b6. Read the comment docs.