Fixed npm packages (security audit & updated module)

[ghost]

fixes #1646

Fixed outdated npm packages without breaking changes

Before

found 53 vulnerabilities (4 low, 38 moderate, 10 high, 1 critical) in 9702 scanned packages
  51 vulnerabilities require semver-major dependency updates.
  2 vulnerabilities require manual review. See the full report for details.

After

found 6 vulnerabilities (2 low, 4 high) in 13516 scanned packages
  5 vulnerabilities require semver-major dependency updates.
  1 vulnerability requires manual review. See the full report for details.

Changes

• Removed open dependency as it has critical vulnerability

• Removed gulp-util as it has critical vulnerability

• Moved dependency from babel-preset-es2015 to babel-preset-env

To-do

Maintain packages as it is already used from MyEtherWallet V5 codebase

Related issue: EthereumCommonwealth#236