Update build instructions to support pcks11 by default.
@@ -108,7 +108,8 @@ Set [```GOPATH```](https://golang.org/doc/code.html#GOPATH). Then, run:
```bash
$ go get github.com/theupdateframework/notary
-$ go install github.com/theupdateframework/notary/cmd/notary
+# build with pcks11 support by default to support yubikey
+$ go install -tags pkcs11 github.com/theupdateframework/notary/cmd/notary
$ notary
```
