Update required go version

I believe 1.15 is required for testing.T.TempDir.

diff --git a/go.mod b/go.mod
index 836d5f7bed3b9ed1e998cd9e1cf98194098d526e..80e2ef1b8f84a0a8611ce6aae339fb840e645cda 100644 (file)
--- a/go.mod
+++ b/go.mod
@@ -40,7 +40,7 @@ require (
        golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
 )
 
-go 1.13
+go 1.15
 
 exclude bazil.org/fuse v0.0.0-20200419173433-3ba628eaf417