Adding flag for Standalone mode [deploy][prerelease]

 Alpha 7 prerelease (117b9d61c9) (SeleniumHQ#1107) [deploy][prerelease]

* Alpha 7 prerelease (117b9d61c9)

* Relaxing checks for hub

This makes 3.x clients work when they do not send the content-type header.
In the major release, users will need to enable this themselves.

* Relaxing checks for router

This makes 3.x clients work when they do not send the content-type header.
In the major release, users will need to enable this themselves.

Alpha 7 prerelease (43fc7cf908) (SeleniumHQ#1106) [deploy][prerelease]

Trigger Alpha 7 prerelease (5a5bc38279) [deploy][prerelease]

3.141.59-20200826 release

4.0.0-alpha-6-20200730 [deploy]

3.141.59-20200730 release

4.0.0-alpha-6-20200721 (branch fix) [deploy]

4.0.0-alpha-6-20200720 release

3.141.59-20200719 release