hswaw/site: implement recurring events

Change-Id: Ib3c570d058141c4d8441801010f0f1755ccfc0e7
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1624
Reviewed-by: radex <radex@hackerspace.pl>
diff --git a/go.mod b/go.mod
index f46fcd9..8e323ad 100644
--- a/go.mod
+++ b/go.mod
@@ -92,6 +92,7 @@
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.8.4
+	github.com/teambition/rrule-go v1.8.2
 	github.com/ulule/limiter/v3 v3.11.2
 	github.com/ziutek/telnet v0.0.0-20180329124119-c3b780dc415b
 	golang.org/x/crypto v0.11.0