Remove bin/spinach

bin/spinach

-#!/usr/bin/env ruby
-
-# Remove this block when removing rails5? code.
-gemfile = %w[1 true].include?(ENV["RAILS5"]) ? "Gemfile.rails5" : "Gemfile"
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../#{gemfile}", __dir__)
-
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
-require 'bundler/setup'
-load Gem.bin_path('spinach', 'spinach')