Update README.md
Validation of changed attributes.

Validation of only dirty(changed) attributes. This resolves validation of unique values that are unchanged - as unchanged ones should validate. This should resolve #23 as well I believe.

This seems to work from my tests, hope it helps.
Merge pull request #24 from TheBox193/patch-1

Validation of changed attributes.
Reset validation to use this->attributes rather than the getDirty method
Added "setConnection" to Validator, so that the model's connection is pulled in for any database rules.

Signed-off-by: Kennon Bickhart <kennon@kennonb.me>
Merge pull request #28 from kennonb/master

Added "setConnection" to Validator
Merge branch 'master' of github.com:philipbrown/magniloquent