We rename `ChanUpdateOptionMaxHtlc` to `ChanUpdateRequiredMaxHtlc`
as with the latest changes it is now required.
Similarly, rename `validateOptionalFields` to
`ValidateChannelUpdateFields`, export it to use it in a later commit.
The lnwire package implements the Lightning Network wire protocol.
This package has intentionally been designed so it can be used as a standalone
package for any projects needing to interface with lightning peers at the wire
protocol level.
Installation and Updating
$ go get -u github.com/lightningnetwork/lnd/lnwire
dd5273c88c
