remove compare version of jar-dependencies in Rakefile.

Rakefile

@@ -14,13 +14,7 @@ desc 'Install the JAR dependencies to vendor/'
 task :install_jars do
   # We actually want jar-dependencies will download the jars and place it in
   # vendor/jar-dependencies/runtime-jars
-  if Gem::Version.new(Jars::VERSION) >= Gem::Version.new('0.3.4')
-    Jars::Installer.new.vendor_jars!(false, 'vendor/jar-dependencies/runtime-jars')
-  else
-  	ENV['JARS_HOME'] = Dir.pwd + "/vendor/jar-dependencies/runtime-jars"
-  	ENV['JARS_VENDOR'] = "false"
-  	Jars::Installer.new.vendor_jars!(false)
-  end
+  Jars::Installer.new.vendor_jars!(false, 'vendor/jar-dependencies/runtime-jars')
 end
 
 task build: :install_jars