gem: update dependencies

.rubocop.yml

@@ -34,6 +34,9 @@ Metrics/MethodLength:
 Metrics/PerceivedComplexity:
   Enabled: false
 
+Naming/UncommunicativeMethodParamName:
+  Enabled: false
+
 Style/ConditionalAssignment:
   Enabled: false
 

dyndnsd.gemspec

@@ -1,5 +1,5 @@
 
-$LOAD_PATH.push File.expand_path('../lib', __FILE__)
+$LOAD_PATH.push File.expand_path('lib', __dir__)
 
 require 'dyndnsd/version'
 
@@ -32,5 +32,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rack-test'
-  s.add_development_dependency 'rubocop', '~> 0.52.1'
+  s.add_development_dependency 'rubocop', '~> 0.54.0'
 end

lib/dyndnsd/helper.rb

@@ -13,9 +13,9 @@ module Dyndnsd
 
     def self.ip_valid?(ip)
       IPAddr.new(ip)
-      return true
+      true
     rescue ArgumentError
-      return false
+      false
     end
 
     def self.user_allowed?(username, password, users)