go.mod: fix module file to prevent go from updating it during build

Author: karalabe

go.mod

@@ -35,7 +35,7 @@ require (
 	github.com/google/uuid v1.1.5
 	github.com/gorilla/websocket v1.4.2
 	github.com/graph-gophers/graphql-go v0.0.0-20201113091052-beb923fada29
-	github.com/hashicorp/go-bexpr v0.1.10 // indirect
+	github.com/hashicorp/go-bexpr v0.1.10
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d
 	github.com/holiman/bloomfilter/v2 v2.0.3
 	github.com/holiman/uint256 v1.2.0