style: apply structpack & goimport (#469)

* refactor: reorder import statements in fetch.go and fetch_test.go

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

* fix: optimize struct field alignment to reduce memory usage

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

---------

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

lib/policy/bot.go

@@ -8,10 +8,10 @@ import (
 )
 
 type Bot struct {
+	Rules     Checker
+	Challenge *config.ChallengeRules
 	Name      string
 	Action    config.Rule
-	Challenge *config.ChallengeRules
-	Rules     Checker
 }
 
 func (b Bot) Hash() string {