Fix the following issues according to rubocop:
runtime/autoload/provider/script_host.rb:2:11: C: Prefer single-quoted strings when you don't need string interpolation or special symbols.
require "neovim/ruby_provider"
^^^^^^^^^^^^^^^^^^^^^^
runtime/autoload/provider/script_host.rb:5:5: C: Prefer single-quoted strings when you don't need string interpolation or special symbols.
"Your neovim RubyGem is missing or out of date. " +
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
runtime/autoload/provider/script_host.rb:5:55: C: Use \ instead of + or << to concatenate those strings.
"Your neovim RubyGem is missing or out of date. " +
runtime/autoload/provider/script_host.rb:6:5: C: Prefer single-quoted strings when you don't need string interpolation or special symbols.
"Install the latest version using `gem install neovim`."
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This commit assumes Ruby 2.0.0+.