install doc: openHABian uses openHAB version 2.1.0 (minor change)

[hreichert]

The installation documentation for openHABian says:

• openHAB 2 in the latest recommended version (2.0.0 stable)

But openHABian uses OpenHAB version 2.1.0; so changed to this:

• openHAB 2 in the latest recommended version (2.1.0 stable)

[ThomDietrich]

Thanks for the hint @hreichert I've fixed the issue in the openHABian repository and the newest version of the document will soon be visible in docs.

[bgilmer77]

Consider eliminating reference to a specific version/subversion of OH. The statement creates an ongoing document maintenance issue. Unless OHabian will not track the latest version, then isn't it sufficient to simply say, "openHAB 2 in the latest recommended version"?

[Confectrician]

@bgilmer77 is totally right.
We have enough issues with different versions of bindings, snapshots, etc.

The concrete Version-Number doesn't matter here and we could save time and unnecessary work here.

[ThomDietrich]

That is definitely correct. The line was originally introduced when openHAB 2.0 was in its non-stable state. Nowadays openHABian simply follows the latest stable. I'll remove the exact version number.