Update release instructions in CONTRIBUTING.md

[benjie]

npm publish npmDist fails:

$ npm publish npmDist                  
npm ERR! code E404                                                            
npm ERR! 404 Not Found - GET https://registry.npmjs.org/npmDist - Not found                                                                                                                    
npm ERR! 404                                                                  
npm ERR! 404  'npmDist@*' is not in this registry.                            
npm ERR! 404 This package name is not valid, because                                                                                                                                           
npm ERR! 404  1. name can no longer contain capital letters                   
npm ERR! 404                                                                  
npm ERR! 404 Note that you can also install from a                            
npm ERR! 404 tarball, folder, http url, or git url.  

However cd npmDist && npm publish works.

I've also fixed the releases URL, and added the npm run changelog command with final instruction.

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[benjie]

We should probably also note somewhere that the releasing user needs to have Docker installed and docker run hello-world should work without error.