Wyatt/update compiler

[spacesailor24]

Description

Unifies babel compiler for web3-eth2-core and web3-eth2-beaconchain

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build and tested dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

[coveralls]

Pull Request Test Coverage Report for Build 519298005

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 226 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+2.5%) to 76.273%

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Files with Coverage Reduction	New Missed Lines	%
packages/web3-core-requestmanager/src/jsonrpc.js	1	70.0%
packages/web3-core-helpers/src/formatters.js	8	82.27%
packages/web3-utils/src/utils.js	27	10.74%
packages/web3-core-helpers/src/errors.js	29	1.56%
packages/web3-utils/src/soliditySha3.js	34	3.92%
packages/web3-utils/src/index.js	42	32.12%
packages/web3-eth-accounts/src/index.js	85	33.06%

Totals
Change from base Build 519283962:	2.5%
Covered Lines:	3172
Relevant Lines:	3944

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💛 - Coveralls