proposal for major bump on package v0.3.0 #48

This is continuation of #46

I was amazed to see that this package was compitable with node js v0.6.x

as even nodejs group also do not provide that much backward compatablity(reference)

The reason why I'm requesting this is so

• Morden projects can take advantage of latest ES6 features
• Current package code can be optimized to have even more tiny footprint

Challenges

• Currently it's very hard to develop for node v0.6.0 even current Travis CI build fails due to Segmentation fault same happned when I tried the same on digitalocean droplet screenshots below
  
  
• GitHub Actions is also unable to setup nodejs v0.6.x (v0.8.0) works

PS people can still can use querystring@0.2.x if they want to support legacy node versions
also there's very good chance that if somebody is running node v0.6 currently then they might never update their npm packages :P