Go mod tidy

go.mod

@@ -8,23 +8,20 @@ require (
 	github.com/boombuler/barcode v0.0.0-20170618053812-56ef0af91246 // indirect
 	github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737
 	github.com/cenkalti/backoff v2.2.1+incompatible
-	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 	github.com/coreos/go-systemd/v22 v22.1.0
 	github.com/go-ldap/ldap/v3 v3.2.4
 	github.com/go-sql-driver/mysql v1.4.0
 	github.com/google/go-cmp v0.5.4
 	github.com/lib/pq v0.0.0-20190326042056-d6156e141ac6
 	github.com/mattn/go-sqlite3 v0.0.0-20180926090220-0a88db3545c4
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/patrickmn/go-cache v0.0.0-20180815053127-5633e0862627
-	github.com/pierrec/lz4 v2.0.5+incompatible // indirect
 	github.com/pquerna/otp v1.0.0
 	github.com/prometheus/client_golang v1.9.0
 	github.com/theckman/go-flock v0.8.0
 	github.com/tstranex/u2f v1.0.0
 	go.opencensus.io v0.22.5
-	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 // indirect
 	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	google.golang.org/appengine v1.4.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v2 v2.3.0
 )