Quick way to check current supported frontend version

[Dicebot via D.gnu]

I have just got `gdc` Arch Linux package flagged out of date with 
a comment that support for 2.066 frontend is out. Can't remember 
any announcement and it seems like false alarm but just to be 
extra sure - what is the most simple way to check last supported 
version in repo? (4.9 branch)