Delete a comma for Node.js <= v7.x

[3846masa]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

No

Motivation / Use-Case

fixes #1607

Trailing commas in function syntax is not supported in Node.js <= v7.x
Remove comma.

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #1609 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1609   +/-   ##
=======================================
  Coverage   74.25%   74.25%           
=======================================
  Files          10       10           
  Lines         672      672           
=======================================
  Hits          499      499           
  Misses        173      173

Impacted Files	Coverage Δ
lib/Server.js	81.74% <ø> (ø)	⬆️

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