Modernize eslint and prettier config

[ericpassmore]

Change

Modernized eslint and prettier config. Fixes #11

Listing of Commits

GIT LOGS 6fba4d7 standardized eslint and prettier configs 4a56bc8 removed BigInt from serialization tests

Listing of Files Changed

.eslintrc .prettierrc package-lock.json package.json src/eosjs-jsonrpc.ts src/eosjs-serialize.ts src/tests/serialization.test.ts yarn.lock

API Changes

None

Documentation Additions

None found - did a check for eslint in *.md files did not find anything

[ericpassmore]

Fixes #11