Update the typescript example in README.md

[winksaville]

The update makes the example execute using typescript 2.2.2. The
following changes were made.

• Changed lookupType parameter to "awesomepackage.AwesomeMessage"
• Use let instead of var as its consider a better style
• Add type : any for message
• Add printing of message.awesomeField
• Add example of decoding of buffer and printing result
• Commented out redundant or non-executable lines

[winksaville]

I had trouble getting the example working so I thought I provide this PR to help others. I was surprised I needed to explicitly type message and decodedMessage to : any. Is there something I did incorrectly to require the : any?

[dcodeIO]

I was surprised I needed to explicitly type message and decodedMessage to : any

This might be the case because you are accessing its properties with dot syntax (message.awesomeField) but messages dynamically created at runtime technically have no typings and are just instanceof protobuf.Message. Does it work when using message["awesomeField"]?

If you'd like to have proper typings for dynamic messages, too, you could still use pbts-generated typings for its static counterpart with your dynamic code.

[winksaville]

Thanks for the feed back and updating README.md