Rakefile in ronin-exploits-1.0.0 vs Rakefile in ronin-exploits-1.0.1

@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'rubygems'
 
 begin
   require 'bundler'
 rescue LoadError => e
   warn e.message
   warn "Run `gem install bundler` to install Bundler."
-  exit -1
+  exit(-1)
 end
 
 begin
   Bundler.setup(:development)
 rescue Bundler::BundlerError => e