Consider removing -beta tag

[TonyGiorgio]

Background

When running go get http://github.com/lightningnetwork/lnd, it tries to pull down a very old version of lnd that was accidentally published without the beta flag. I understand why one may still want to consider LND beta software, but with go conventions around the -beta tag, it makes things difficult for those without that knowledge. It's not typical in any other of my golang projects (and probably other people as well) to be specifying beta libraries. I think that should be reserved for RC's.

If it's still considered that LND is "beta", then you can keep using v0.X.X without the -beta flag and that would still be the semver way of declaring something as beta.

Chatting with @guggero on slack, he seemed to have tried to retract the old non-beta version of LND but it's not possible without there being any other non-beta version.

Steps to reproduce

Run go get http://github.com/lightningnetwork/lnd

Expected behaviour

It should get the latest version of LND.

Actual behaviour

It gets v0.0.2

[litch]

Pretty please with a 🍒on top