Update to go 1.17 (#208)

go.mod

@@ -1,6 +1,6 @@
 module github.com/tendermint/tm-db
 
-go 1.16
+go 1.17
 
 require (
 	github.com/dgraph-io/badger/v2 v2.2007.2
@@ -14,6 +14,25 @@ require (
 	google.golang.org/grpc v1.42.0
 )
 
+require (
+	github.com/DataDog/zstd v1.4.1 // indirect
+	github.com/cespare/xxhash v1.1.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dgraph-io/ristretto v0.0.3-0.20200630154024-f66de99634de // indirect
+	github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/golang/snappy v0.0.1 // indirect
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/net v0.0.0-20201021035429-f5854403a974 // indirect
+	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
+	golang.org/x/text v0.3.3 // indirect
+	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)
+
 // Breaking changes were released with the wrong tag (use v0.6.6 or later).
 retract v0.6.5