Merge pull request #15 from rubyatscale/better-rspec-check

Fix rspec check

Author: technicalpickles

lib/singed.rb

@@ -53,4 +53,4 @@ def filter_line(line)
 
 require 'singed/kernel_ext'
 require 'singed/railtie' if defined?(Rails::Railtie)
-require 'singed/rspec' if defined?(RSpec)
+require 'singed/rspec' if defined?(RSpec) && RSpec.respond_to?(:configure)