Version 3.0 beta

I think version 3 is ready to be released into the wild. However, I like to wait and see if there are some testers who are willing to provide feedback, maybe detect remaining bugs, …

\usepackage{acro}

is the same as

\usepackage[version=3,upgrade=true]{acro}

Testing isn't even that brave, there is

\usepackage[version=2]{acro}

which loads the last version that has been released to CTAN prior to version 3.