chore(deps): update dependency restify to v6.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
restify (source)	6.3.4 -> 6.4.0

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Release Notes

restify/node-restify (restify)

v6.4.0

Compare Source

Bug Fixes

• server should fire not acceptable event (#​1627) (8b11b71b)
• send numbers or bools as payloads (#​1609) (0919f26d)
• Allow multiple unmerged set-cookie headers. (#​1570) (df040154)
• add support for secureOptions in createServer (#​1575) (656e60e0)
• use Buffer.isBuffer instead of util.isBuffer. (#​1593) (35bd1c2b)
• jsonBodyParser: fix percent sign causing server fail (#​1411) (bde8fda6)
• request: date() and time() methods return value (#​1576) (4c2cb1a7)

6.3.4 (2017-11-21)

Bug Fixes

• bodyReader: Fix memory leak (#​1566) (756b3f02)
• server: avoiding uncaughtException in _routeErrorResponse by only sending response when (cf65c65c)

6.3.2 (2017-11-08)

6.3.1 (2017-11-03)

Bug Fixes

• server: avoid http2 experimental warning without http2 option (#​1555) (12da7fdf)

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