fixing rubocop for remaining ruby versions

.rubocop-2.3.yml

@@ -16,3 +16,6 @@ Layout/LineLength:
   Exclude:
     - 'test/resolver/native_test.rb'
   Max: 140
+
+Layout/RescueEnsureAlignment:
+  Enabled: false

.rubocop-2.4.yml

@@ -5,3 +5,11 @@ Style/OptionalBooleanParameter:
 
 Gemspec/RequiredRubyVersion:
   Enabled: false
+
+Lint/MissingSuper:
+  Exclude:
+    - 'lib/httpx/io/unix.rb'
+
+Style/HashTransformValues:
+  Exclude:
+    - 'lib/httpx/plugins/digest_authentication.rb'

lib/httpx/io/unix.rb

@@ -8,7 +8,6 @@ module HTTPX
 
     def_delegator :@uri, :port, :scheme
 
-    # rubocop:disable Lint/MissingSuper
     def initialize(uri, addresses, options)
       @uri = uri
       @addresses = addresses
@@ -30,7 +29,6 @@ module HTTPX
       end
       @io ||= build_socket
     end
-    # rubocop:enable Lint/MissingSuper
 
     def hostname
       @uri.host

lib/httpx/plugins/digest_authentication.rb

@@ -81,7 +81,7 @@ module HTTPX
 
           uri = request.path
 
-          params = Hash[auth_info.split(/ *, */) # rubocop:disable Style/HashTransformValues
+          params = Hash[auth_info.split(/ *, */)
                                  .map { |val| val.split("=") }
                                  .map { |k, v| [k, v.delete("\"")] }]
           nonce = params["nonce"]