Errno::EBADF in `DevServer.running?

[ketan]

See similar issue #745.

I'm running on jruby 9.1.13.0 and getting a Errno::EBADF when the webpack dev server is not running. Perhaps it's appropriate to catch all exceptions here and return a false? I can submit a PR if the solution is acceptable.

webpacker/lib/webpacker/dev_server.rb

Lines 12 to 17 in a9a6a67

	def running?
	Socket.tcp(host, port, connect_timeout: connect_timeout).close
	true
	rescue Errno::ECONNREFUSED, Errno::ETIMEDOUT, NoMethodError
	false
	end

[gauravtiwari]

Yes, please feel free to submit a PR 👍