Protocol and port control

[zupo]

Continuation of #201.

Refs #176.

[blueracer-io]

Unit tests performance report: ✅

Everything looks great, carry on!

Branch	Number of tests	Suite duration	Mean test duration
main	86	1.7s1	18.6ms1
add/proto_port2	87 (1%)	1.5s (-14%)	16.9ms (-9%)

Found 1 new test, this is how it compares to existing tests:

Name	Duration	Percentile Score	Status
test_views.test_add_explorer_view_custom_proto_port	16ms	slower than 41% of existing tests	✅

Footnotes

1. The median/mean of the previous 13 runs. ↩ ↩²

2. More specifically from commit 636981fa8a75f4b67fba90bf1e61e86c3ee08d1f in run #1. ↩

[jschaeff]

Thank you for integrating this little patch.

I realize it misses some documentation now.

Maybe we could add this in the README: https://github.com/Pylons/pyramid_openapi3#advanced-configuration 👍

### Specify protocol and port for getting the openapi3 spec file

Sometimes, it is neccessary to specify the protocol and port to access the openapi3 spec file. This can be configured in the `pyramid_openapi3_add_explorer` function, like for instance:

    config.pyramid_openapi3_add_explorer(route="/", proto_port=('https', 443))