Update nginx from 1.17.5 to 1.17.6.
Update njs module from 0.3.6 to 0.3.7.

<ChangeLog with nginx 1.17.6>

*) Feature: the $proxy_protocol_server_addr and

$proxy_protocol_server_port variables.

*) Feature: the "limit_conn_dry_run" directive.

*) Feature: the $limit_req_status and $limit_conn_status variables.

</ChangeLog>

<ChangeLog with njs 0.3.7>

nginx modules:

*) Improvement: refactored iteration over external objects.

Core:

*) Feature: added Object.assign().

*) Feature: added Array.prototype.copyWithin().

*) Feature: added support for labels in console.time().

*) Change: removed console.help() from CLI.

*) Improvement: moved constructors and top-level objects to

global object.

*) Improvement: arguments validation for configure script.

*) Improvement: refactored JSON methods.

*) Bugfix: fixed heap-buffer-overflow in njs_array_reverse_iterator()

function. The following functions were affected:
Array.prototype.lastIndexOf(), Array.prototype.reduceRight().

*) Bugfix: fixed Prototype slot of NativeErrors.

*) Bugfix: fixed NativeError.prototype.message properties.

*) Bugfix: added conversion of "this" value to object in

Array.prototype functions.

*) Bugfix: fixed iterator for Array.prototype.find() and

Array.prototype.findIndex() functions.

*) Bugfix: fixed Array.prototype.includes() and

Array.prototype.join() with "undefined" argument.

*) Bugfix: fixed "constructor" property of "Hash" and "Hmac"

objects.

*) Bugfix: fixed "proto" property of getters and setters.

*) Bugfix: fixed "Date" object string formatting.

*) Bugfix: fixed handling of NaN and -0 arguments in Math.min()

and Math.max().

*) Bugfix: fixed Math.round() according to the specification.

*) Bugfix: reimplemented "bound" functions according to

the specification.

</ChangeLog>