Bump rex-socket to pull in validation changes

Gemfile

@@ -53,5 +53,3 @@ group :test do
   gem 'timecop'
 end
 
-# remove after https://github.com/rapid7/rex-socket/pull/65 is landed
-gem 'rex-socket', git: 'https://github.com/zeroSteiner/rex-socket', branch: 'feat/util-is-name'

Gemfile.lock

@@ -1,11 +1,3 @@
-GIT
-  remote: https://github.com/zeroSteiner/rex-socket
-  revision: 764718bf3dd397c0a5ecc41ee0874d826e9c9144
-  branch: feat/util-is-name
-  specs:
-    rex-socket (0.1.56)
-      rex-core
-
 PATH
   remote: .
   specs:
@@ -427,6 +419,8 @@ GEM
       metasm
       rex-core
       rex-text
+    rex-socket (0.1.56)
+      rex-core
     rex-sslscan (0.1.10)
       rex-core
       rex-socket
@@ -568,7 +562,6 @@ DEPENDENCIES
   pry-byebug
   rake
   redcarpet
-  rex-socket!
   rspec-rails
   rspec-rerun
   rubocop