Open3 needs to be required manually

I tried merging this into typescript-rails and it failed with those error messages ... I am going to include it manually in typescript-rails until this PR gets merged and released

Author: klaustopher

lib/typescript-node.rb

@@ -3,6 +3,7 @@
 require "typescript-src"
 require "typescript-node/version"
 require "typescript-node/compile_result"
+require "open3"
 
 module TypeScript
   module Node