fix: go mod

Author: bietkul

go.mod

@@ -1,7 +1,6 @@
 module github.com/appbaseio/arc
 
 require (
-	github.com/antonmedv/expr v1.4.2
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/gobuffalo/envy v1.6.15 // indirect
 	github.com/gobuffalo/packr v1.22.0
@@ -10,7 +9,6 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.6.3
 	github.com/olivere/elastic v6.2.21+incompatible
 	github.com/olivere/elastic/v7 v7.0.4
-	github.com/prometheus/common v0.2.0
 	github.com/robfig/cron v1.1.0
 	github.com/rogpeppe/go-internal v1.2.2 // indirect
 	github.com/rs/cors v1.6.0