www/node6: Update 6.11.0 -> 6.11.1

[bhughes]

Summary

www/node6: Update 6.11.0 -> 6.11.1

Approved by: robak (mentor)
MFH: 2017Q3
Security: http://www.vuxml.org/freebsd/3eff66c5-66c9-11e7-aa1d-3d2e663cef42.html

Test Plan

$ pwd
/usr/ports/www/node6
$ portlint -C
WARN: Makefile: [0]: possible direct use of command "python" found. use ${PYTHON_CMD} instead.
WARN: Makefile: possible use of absolute pathname "/etc/make.conf".
0 fatal errors and 2 warnings found.

http://35.176.84.170/data/latest-per-pkg/node6/6.11.1/

[robak]

LGTM, however, the vuxml url doesn't work.

[bhughes]

Yes, I need to commit https://reviews.freebsd.org/D11561 first.