Broken sf(...) Method on 0.5.0 with symfony 2.3

[sharpner]

When calling:

v::create()->sf('Time')->assert('10:10');

I get this error:
Call to undefined method Symfony\Component\Validator\Constraints\TimeValidator::isValid()

Sf2 Validators use the method "validate" not isValid. I could not figure out how this could've worked in the first place.

[alganet]

It seems that Symfony changed their API. Back then it was called "validate" and we never tested against recent versions. I'm gonna take a look! =) Thanks for reporting!

[augustohp]

Fixed on #139 and will be available on 0.6.0 since people using that validator on 0.5.0 with Symfony\Validator <= 0.2.1 would be suddenly affected by the compatibility break.

Tests where added to the validator so we don't keep years without noticing a problem like this!
Thanks a lot for your report @sharpner!