fix lint errors

app.rb

@@ -432,7 +432,7 @@ get "/chunked/:delay" do
   delay = Float(params[:delay])
   stream do |out|
     30.times do |i|
-      out << jsonify({id: i, message: i % 2 == 0 ? "tick" : "tock"})
+      out << jsonify({id: i, message: (i % 2).zero? ? "tick" : "tock"})
       sleep delay
     end
   end

lib/config.rb

@@ -31,8 +31,7 @@ class Config
   end
 
   def to_json(options = nil)
-    if options &&
-       options.key?(:pretty) &&
+    if options&.key?(:pretty) &&
         options[:pretty] == true
       JSON.pretty_generate as_json(options)
     else

spec/sensitive_spec.rb

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift File.dirname(__FILE__) + "/../lib"
 
 require "sensitive"
 
-ALPHABET = ('a' .. 'z').reduce(:concat)
+ALPHABET = ("a".."z").reduce(:concat)
 
 describe "Sensitive" do
   before do