Remove redundant rb-readline from Gemfile

MSP-11585

The entry in the gemspec is sufficient.

Author: limhoff-r7

Gemfile

@@ -3,8 +3,6 @@ source 'https://rubygems.org'
 #   spec.add_runtime_dependency '<name>', [<version requirements>]
 gemspec
 
-gem 'rb-readline', require: false
-
 group :db do
   # Needed for Msf::DbManager
   gem 'activerecord', '>= 3.0.0', '< 4.0.0'

Gemfile.lock

@@ -232,7 +232,6 @@ DEPENDENCIES
   pg (>= 0.11)
   pry
   rake (>= 10.0.0)
-  rb-readline
   redcarpet
   rspec (>= 2.12, < 3.0.0)
   rspec-rails (>= 2.12, < 3.0.0)