use filp/whoops ^2.0

[samsonasik]

composer update after composer create project got filp/whoops == 2.0.0 not found, fill with ^2.0 should make it works.

[weierophinney]

Actually, this won't work.

filp/whoops 2.0 requires a minimum PHP version of 5.5.9; we've specified ^5.5, which means if you're on an earlier version, specifying ^2.0 means it cannot be installed.

Additionally, the version in composer.json is only for testing the installer scripts themselves; the installer lets composer autoselect the version, which works fine as 1.1 and 2.0 are compatible for the use cases we have in Expressive.

I'll merge, but I'm going to change it to ^1.1 || ^2.0.