refact: Remove private $exceptions declaration per discussion
refact: Remove private $exceptions declaration per discussion

Per @veewee:
"I would avoid the local state since the run method can theoretically be
called multiple times which causes an issue and we don't really need
this state internally.

A try/catch over the if statement will solve the issue you are
addressing as well."

Ref https://github.com/phpro/grumphp/pull/541#discussion_r221252425

phpro/grumphp,Big-Shark/grumphp,veewee/grumphp,phpro/grumphp,tombevers/grumphp,janvernieuwe/grumphp,Big-Shark/grumphp,janvernieuwe/grumphp,veewee/grumphp,tombevers/grumphp