the sole command is :
aur-update [VERSION NUMBER] [TARBALL URL]
this updates the version number, release number, source url, and checksums, allowing for a quick way to update the PKGBUILDS you maintain whenever a new upstream release is made.
for example:
aur-update 0.1.0 'https://github.com/getchoo/aur-update/archive/0.1.0.tar.gz'