use guard-rspec 4.4.2

Guardfile

@@ -1,5 +1,19 @@
-guard 'rspec', :version => 2 do
-  watch(%r{^spec/(.*)_spec.rb})
-  watch(%r{^lib/(.*).rb})       { |m| "spec/#{m[1]}_spec.rb" }
-  watch('spec/spec_helper.rb')  { "spec" }
+guard :rspec, cmd: "bundle exec rspec" do
+  require "ostruct"
+
+  rspec = OpenStruct.new
+  rspec.spec_dir = "spec"
+  rspec.spec = ->(m) { "#{rspec.spec_dir}/#{m}_spec.rb" }
+  rspec.spec_helper = "#{rspec.spec_dir}/spec_helper.rb"
+
+  # matchers
+  rspec.spec_files = %r{^#{rspec.spec_dir}/.+_spec\.rb$}
+
+  # Ruby apps
+  ruby = OpenStruct.new
+  ruby.lib_files = %r{^(lib/.+)\.rb$}
+
+  watch(rspec.spec_files)
+  watch(rspec.spec_helper) { rspec.spec_dir }
+  watch(ruby.lib_files)    { |m| rspec.spec.(m[1]) }
 end

guard-spork.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'bundler',     '~> 1.0'
   s.add_development_dependency 'rspec',       '~> 3.1'
   s.add_development_dependency 'transpec'
-  s.add_development_dependency 'guard-rspec', '~> 1.0'
+  s.add_development_dependency 'guard-rspec', '~> 4.4'
   s.add_development_dependency 'pry',         '~> 0.9.12.6'
 
   s.files        = Dir.glob('{lib}/**/*') + %w[LICENSE README.md]