Merge pull request #39 from Roasbeef/go1.13

sphinx: remove dependency on lnd's tlv package

Author: Roasbeef

.travis.yml

@@ -7,7 +7,7 @@ cache:
     - $GOPATH/src/github.com/golang
 
 go:
-  - "1.12.x"
+  - "1.13.x"
 
 sudo: required
 

go.mod

@@ -6,6 +6,8 @@ require (
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
 	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
 	github.com/davecgh/go-spew v1.1.1
-	github.com/lightningnetwork/lnd v0.7.1-beta.0.20190807225126-ea77ff91c221
 	golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67
+	golang.org/x/sys v0.0.0-20190209173611-3b5209105503 // indirect
 )
+
+go 1.13