RFE: Mark tests that require internet?

[Scott Talbert]

Would you be willing to consider a mark or option to exclude tests that require internet access (ie, PyPI)?

Use case would be: running tests in package build systems that prohibit internet access.

[Henry Schreiner]

"network" is a common mark name for this.

[Scott Talbert]

@henryiii thanks a lot for the quick implementation!