Fix for use for spring 4

spring 4 changed, files, directories to be hashes instead of Sets ( rails/spring@7f4ddf9 )

Author: fcheung

lib/spring/watcher/listen.rb

@@ -43,7 +43,7 @@ def subjects_changed
       end
 
       def watching?(file)
-        files.include?(file) || file.start_with?(*directories)
+        files.include?(file) || file.start_with?(*directories.keys)
       end
 
       def changed(modified, added, removed)
@@ -56,8 +56,8 @@ def changed(modified, added, removed)
 
       def base_directories
         ([root] +
-          files.reject       { |f| f.start_with? "#{root}/" }.map { |f| File.expand_path("#{f}/..") } +
-          directories.reject { |d| d.start_with? "#{root}/" }
+          files.keys.reject       { |f| f.start_with? "#{root}/" }.map { |f| File.expand_path("#{f}/..") } +
+          directories.keys.reject { |d| d.start_with? "#{root}/" }
         ).uniq.map { |path| Pathname.new(path) }
       end
     end

spring-watcher-listen.gemspec

@@ -18,6 +18,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake"
   spec.add_development_dependency "activesupport"
 
-  spec.add_dependency "spring", ">= 1.2", "< 4.0"
+  spec.add_dependency "spring", ">= 4", "< 5"
   spec.add_dependency "listen", ">= 2.7", '< 4.0'
 end