addressing a Perl::Critic complaint

fixing a couple instances of 'Method invokation should use "()" at line
X, column Y.  Use "->MethodName()" instead of "->MethodName".'

i don't plan to address the complaints about names being in CamelCase or
the accessing of private member data; the first i think is overly
nitpicky, and the second i think is Perl::Critic misidentifying a
Readonly hash as an object.