Feature: Add support to check whether an exchange supports automatic currency pair updates and if they don't, show a warning if the last currency pair update is >= 30 days

Also fix race condition in config get/set functions

exchanges/gemini/gemini.go

@@ -109,6 +109,7 @@ func (g *Gemini) SetDefaults() {
 	g.ConfigCurrencyPairFormat.Delimiter = ""
 	g.ConfigCurrencyPairFormat.Uppercase = true
 	g.AssetTypes = []string{ticker.Spot}
+	g.SupportsAutoPairUpdating = true
 }
 
 // Setup sets exchange configuration parameters
@@ -138,6 +139,10 @@ func (g *Gemini) Setup(exch config.ExchangeConfig) {
 		if err != nil {
 			log.Fatal(err)
 		}
+		err = g.SetAutoPairDefaults()
+		if err != nil {
+			log.Fatal(err)
+		}
 	}
 }