CLEANUP: Update badges.

README.md

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 # go-bip32
 
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 An implementation of the BIP32 spec for Hierarchical Deterministic Bitcoin addresses as a simple Go library. The semantics of derived keys are up to the user. [BIP43](https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki) and [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) are good schemes to implement with this library. An additional library for either or both of those on top of this library should be developed.