Don't require Runner until actually needed

This prevents printing confusing SimpleCov output when running `bashcov
--help` or `bashcov --version`.

Author: infertux

bin/bashcov

@@ -8,6 +8,8 @@ require "bashcov"
 
 Bashcov.parse_options! ARGV
 
+require "bashcov/runner"
+
 runner = Bashcov::Runner.new Bashcov.command
 status = runner.run
 coverage = runner.result

lib/bashcov.rb

@@ -3,7 +3,6 @@
 require "optparse"
 require "pathname"
 
-require "bashcov/runner"
 require "bashcov/version"
 
 # Bashcov default module

spec/spec_helper.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "bashcov"
+require "bashcov/runner"
 
 Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each { |file| require file }