Fix jQuery version download task

Rakefile

@@ -9,7 +9,7 @@ task :guard_version do
   def check_version(file, pattern, constant)
     body = File.read("vendor/assets/javascripts/#{file}")
     match = body.match(pattern) or abort "Version check failed: no pattern matched in #{file}"
-    file_version = body.match(pattern)[1]
+    file_version = match[1]
     constant_version = Jquery::Rails.const_get(constant)
 
     unless constant_version == file_version
@@ -20,29 +20,19 @@ task :guard_version do
   check_version('jquery.js', /jQuery JavaScript Library v([\S]+)/, 'JQUERY_VERSION')
 end
 
+desc "Update jQuery versions"
 task :update_jquery do
-  puts "Downloading jquery.js"
-  puts `curl -o vendor/assets/javascripts/jquery.js http://code.jquery.com/jquery.js`
-  puts "Downloading jquery.min.js"
-  puts `curl -o vendor/assets/javascripts/jquery.min.js http://code.jquery.com/jquery.min.js`
-  puts "Downloading jquery.min.map"
-  puts `curl -o vendor/assets/javascripts/jquery.min.map http://code.jquery.com/jquery.min.map`
-
-  puts "Updating version.rb"
-  version = false
-  File.foreach('vendor/assets/javascripts/jquery.js') do |line|
-    version = line.match(/jQuery JavaScript Library v([\S]+)/)
-    version = version && version[1]
-    break if version
-  end
-
-  version_path = 'lib/jquery/rails/version.rb'
-  lines = IO.readlines(version_path).map do |line|
-    line.gsub(/JQUERY_VERSION = "([\d\.]+)"/, "JQUERY_VERSION = \"#{version}\"")
-  end
-  File.open(version_path, 'w') do |file|
-    file.puts lines
+  def download_jquery(filename, version)
+    suffix = "-#{version}"
+
+    puts "Downloading #{filename}.js"
+    puts `curl -o vendor/assets/javascripts/#{filename}.js https://code.jquery.com/jquery#{suffix}.js`
+    puts "Downloading #{filename}.min.js"
+    puts `curl -o vendor/assets/javascripts/#{filename}.min.js https://code.jquery.com/jquery#{suffix}.min.js`
+    puts "Downloading #{filename}.min.map"
+    puts `curl -o vendor/assets/javascripts/#{filename}.min.map https://code.jquery.com/jquery#{suffix}.min.map`
   end
 
+  download_jquery('jquery', Jquery::Rails::JQUERY_VERSION)
   puts "\e[32mDone!\e[0m"
 end