do not snap oob gets (#483)

Author: mafintosh

index.js

@@ -927,6 +927,7 @@ module.exports = class Hypercore extends EventEmitter {
       const activeRequests = (opts && opts.activeRequests) || this.activeRequests
 
       const req = this.replicator.addBlock(activeRequests, index)
+      req.snapshot = index < this.length
 
       const timeout = opts && opts.timeout !== undefined ? opts.timeout : this.timeout
       if (timeout) req.context.setTimeout(req, timeout)