2.3.0

• Re-download all current packages if changes are detected to any --binaryXXX parameters as compared to the cached values from last run - to make sure no pre-built binaries end up missing when adding new node ABI versions, for example.
• Fixed downloading pre-built binaries for some packages (such as bcrypt) that use the libc property in their node-pre-gyp format strings.
• Fixed downloading pre-built binaries for some packages (such as bcrypt) which don't have a '/' after their version in the node-pre-gyp format strings
• Upgraded babel v6 to v7
• Updated dependencies to latest versions
• Dropped support for node.js < 6.0.0