Update njs module from 0.4.4 to 0.5.0.
Bump PORTREVISION.

<ChangeLog>
nginx modules:

*) Feature: introduced global "ngx" object.

The following methods were added:
  ngx.log(level, msg)

The following properties were added:
  ngx.INFO,
  ngx.WARN,
  ngx.ERR.

*) Feature: added support for Buffer object where string

is expected.

*) Feature: added Buffer version of existing properties.

The following properties were added:
r.requestBuffer (r.requestBody),
r.responseBuffer (r.responseBody),
r.rawVariables (r.variables),
s.rawVariables (s.variables).

The following events were added in stream module:
upstream (upload),
downstream (download).

*) Improvement: added aliases to existing properties.

The following properties were added:
r.requestText (r.requestBody),
r.responseText (r.responseBody).

*) Improvement: throwing an exception in r.internalRedirect()

for a subrequest.

*) Bugfix: fixed promise r.subrequest() with error_page redirect.

*) Bugfix: fixed promise events handling.

Core:

*) Feature: added TypeScript definitions for built-in

modules.
Thanks to Jakub Jirutka.

*) Feature: tracking unhandled promise rejection.

*) Feature: added initial iterator support.

Thanks to Artem S. Povalyukhin.

*) Improvement: TypeScript definitions are refactored.

Thanks to Jakub Jirutka.

*) Improvement: added forgotten support for

Object.prototype.valueOf() in Buffer.from().

*) Bugfix: fixed heap-use-after-free in JSON.parse().

*) Bugfix: fixed heap-use-after-free in JSON.stringify().

*) Bugfix: fixed JSON.stringify() for arrays resizable via

getters.

*) Bugfix: fixed heap-buffer-overflow for

RegExp.prototype[Symbol.replace].

*) Bugfix: fixed returned value for Buffer.prototype.write*

functions.

*) Bugfix: fixed querystring.stringify().

Thanks to Artem S. Povalyukhin.

*) Bugfix: fixed the catch handler for

Promise.prototype.finally().

*) Bugfix: fixed querystring.parse().

</ChangeLog>