go.mod: upgrade wireguard-go

This should be the last bump before 1.8.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/peterbourgon/ff/v2 v2.0.0
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/tailscale/depaware v0.0.0-20201214215404-77d1e9757027
-	github.com/tailscale/wireguard-go v0.0.0-20210427171738-49072815abad
+	github.com/tailscale/wireguard-go v0.0.0-20210428182031-3b0bcecbf966
 	github.com/tcnksm/go-httpstat v0.2.0
 	github.com/toqueteos/webbrowser v1.2.0
 	go4.org/mem v0.0.0-20201119185036-c04c5a6ff174

go.sum

@@ -145,6 +145,8 @@ github.com/tailscale/wireguard-go v0.0.0-20210419202603-b32acd8f0292 h1:rKgYi0k3
 github.com/tailscale/wireguard-go v0.0.0-20210419202603-b32acd8f0292/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
 github.com/tailscale/wireguard-go v0.0.0-20210427171738-49072815abad h1:TBLOpI682PZf/HvyUYudqMoN0lFMQRfi9zKz+rTlNoA=
 github.com/tailscale/wireguard-go v0.0.0-20210427171738-49072815abad/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
+github.com/tailscale/wireguard-go v0.0.0-20210428182031-3b0bcecbf966 h1:a5/sG5evpLfd7NgnPe54uuB8S71HGDtx+GoOohDn3oM=
+github.com/tailscale/wireguard-go v0.0.0-20210428182031-3b0bcecbf966/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
 github.com/tcnksm/go-httpstat v0.2.0 h1:rP7T5e5U2HfmOBmZzGgGZjBQ5/GluWUylujl0tJ04I0=
 github.com/tcnksm/go-httpstat v0.2.0/go.mod h1:s3JVJFtQxtBEBC9dwcdTTXS9xFnM3SXAZwPG41aurT8=
 github.com/toqueteos/webbrowser v1.2.0 h1:tVP/gpK69Fx+qMJKsLE7TD8LuGWPnEV71wBN9rrstGQ=