go.mod: bump wireguard-go version.

Signed-off-by: David Anderson <danderson@tailscale.com>

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/pborman/getopt v0.0.0-20190409184431-ee0cd42419d3
 	github.com/peterbourgon/ff/v2 v2.0.0
 	github.com/tailscale/winipcfg-go v0.0.0-20200413171540-609dcf2df55f
-	github.com/tailscale/wireguard-go v0.0.0-20200407164751-7f0c43dd1145
+	github.com/tailscale/wireguard-go v0.0.0-20200416194755-23aababa2084
 	github.com/toqueteos/webbrowser v1.2.0
 	go4.org/mem v0.0.0-20200411205429-f77f31c81751
 	golang.org/x/crypto v0.0.0-20200317142112-1b76d66859c6
@@ -30,4 +30,3 @@ require (
 	gortc.io/stun v1.22.1
 	rsc.io/goversion v1.2.0
 )
-

go.sum

@@ -83,6 +83,8 @@ github.com/tailscale/winipcfg-go v0.0.0-20200413171540-609dcf2df55f h1:uFj5bslHs
 github.com/tailscale/winipcfg-go v0.0.0-20200413171540-609dcf2df55f/go.mod h1:x880GWw5fvrl2DVTQ04ttXQD4DuppTt1Yz6wLibbjNE=
 github.com/tailscale/wireguard-go v0.0.0-20200407164751-7f0c43dd1145 h1:n/ErEski7q1+ew00eaoiCmyx/5Wtf9nKBhWYLsmID/U=
 github.com/tailscale/wireguard-go v0.0.0-20200407164751-7f0c43dd1145/go.mod h1:JPm5cTfu1K+qDFRbiHy0sOlHUylYQbpl356sdYFD8V4=
+github.com/tailscale/wireguard-go v0.0.0-20200416194755-23aababa2084 h1:8FolyyuEIqny/MUD2VrTE8Damx0bG+UGix7OXXm0EeY=
+github.com/tailscale/wireguard-go v0.0.0-20200416194755-23aababa2084/go.mod h1:JPm5cTfu1K+qDFRbiHy0sOlHUylYQbpl356sdYFD8V4=
 github.com/toqueteos/webbrowser v1.2.0 h1:tVP/gpK69Fx+qMJKsLE7TD8LuGWPnEV71wBN9rrstGQ=
 github.com/toqueteos/webbrowser v1.2.0/go.mod h1:XWoZq4cyp9WeUeak7w7LXRUQf1F1ATJMir8RTqb4ayM=
 github.com/ulikunitz/xz v0.5.6 h1:jGHAfXawEGZQ3blwU5wnWKQJvAraT7Ftq9EXjnXYgt8=