Composer reads a ^0.4 caret on a 0.x package as >=0.4 <0.5, so this package
could not be installed alongside a server running Resonate v0.5. Widen the
constraint to ^0.4|^0.5; the suite passes against v0.5.1 unchanged.

Also raises webpatser/resonate-roster to ^0.2.3 (the release carrying the
matching v0.5 support) and moves the changelog entries that shipped in v0.2.2
out of Unreleased and under their own heading.