Fix module version update

[masaeokada]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

I updated javascript-obfuscator module from 0.12.2 to 0.16.0 .

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[coveralls]

Coverage remained the same at 76.898% when pulling f01aeb5 on masaeokada:master-fixupdate into 1e7170e on node-red:master.

[coveralls]

Coverage remained the same at 76.898% when pulling f01aeb5 on masaeokada:master-fixupdate into 1e7170e on node-red:master.

[masaeokada]

I found an error in node.js ver.4.
In detail javascript-obfuscator 0.16.0 doesn't support node.js ver.4.