Merge pull request #92 from multiformats/bigs-patch-1

Make memory transport length-prefixed

Author: Stebalien

protocols.csv

@@ -29,4 +29,4 @@ code,	size,	name,	comment
 275,	0,	p2p-webrtc-star,
 276,	0,	p2p-webrtc-direct,
 290,	0,	p2p-circuit,
-777,	64, memory, in memory transport for self-dialing and testing; uint64
+777,	V, memory, in memory transport for self-dialing and testing; arbitrary