restore compatibility with Go 1.16

Fix build error with go 1.16:

  //go:build comment without // +build comment

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools.go b/tools.go
index e59cfdda..b682c002 100644
--- a/tools.go
+++ b/tools.go
@@ -1,4 +1,5 @@
 //go:build tools
+// +build tools
 
 package main