Migrate to babel-preset-env

[ayusharma]

Explain the problem

babel-preset-env is a new preset, first released over a year ago that replaces many presets that were previously used including:

• babel-preset-es2015, babel-preset-es2016, babel-preset-es2017
• babel-preset-latest
• other community plugins involving es20xx:
• babel-preset-node5, babel-preset-es2015-node, etc

Expected Behaviour

• Migrate to babel-preset-env

Actual Behaviour

Not required.

Steps to reproduce

Not required.

Provide a repository that reproduces issue if possible

Not required.

Provide your Environment details

• Node version:
  All

• Operating System:
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• melody version:
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