updated go dependencies

go.mod

@@ -1,15 +1,9 @@
 module github.com/utopia-planitia/k8s-gitlab-gc
 
-go 1.15
+go 1.16
 
 require (
-	github.com/google/go-querystring v1.0.0 // indirect
-	github.com/imdario/mergo v0.3.9 // indirect
-	github.com/plouc/go-gitlab-client v2.0.0-beta.5+incompatible
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d // indirect
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e // indirect
-	k8s.io/api v0.18.5
-	k8s.io/apimachinery v0.18.5
-	k8s.io/client-go v0.0.0-20200430002605-303c51f3d403
-	k8s.io/utils v0.0.0-20200619165400-6e3d28b6ed19 // indirect
+	k8s.io/api v0.22.0
+	k8s.io/apimachinery v0.22.0
+	k8s.io/client-go v0.22.0
 )