I could only make it work if the timestamp had an @ prefix. Otherwise I get a parse error. Is the @ impled, or should it be mentioned in the docs?

I've git cloned the adding in "addons", so I have a "iCal" directory in the "addons" directory.

Here's what happens next :

`➜ git git:(master) ✗ php please addons:refresh
[✗] This command is deprecated. Please use php please update:addons

Adding packages: erin-dalzell/ical, marbles/sitemap
Please wait while dependencies are updated via Composer. This may take a while.
The command "php composer.phar update erin-dalzell/ical marbles/sitemap --prefer-dist --no-dev --optimize-autoloader" failed.
Exit Code: 2(Misuse of shell builtins)

Output:

Error Output:

Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

Problem 1
- The requested package erin-dalzell/ical could not be found in any version, there may be a typo in the package name.

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.
Running update with --no-dev does not mean require-dev is ignored, it just means the packages will not be installed. If dev requirements are blocking the update you have to resolve those problems.

Dependencies updated!
`

same if I do php please update:addons

Unfortunately, I don't understand addons well enough to understand what's going on.

I'm not sure if it matters not if you can do anything about it, but the debug footer (adding the debug bar) is added to the file.