Add doctoc devDependency and npm script
Add doctoc devDependency and npm script

Will use it to generate "Table of Contents"

creationix/nvm,creationix/nvm,PeterDaveHello/nvm,PeterDaveHello/nvm,PeterDaveHelloKitchen/nvm,edwmurph/nvm,evocateur/nvm,PeterDaveHelloKitchen/nvm,edwmurph/nvm,ljharb/nvm,ljharb/nvm,evocateur/nvm