feat: add floor ticker price arrows

This commit adds the arrows option to the floor ticker. This option can
e used to display price diretion arrows with the price.

README.md

@@ -551,6 +551,7 @@ Track the floor price of an NFT collection on OpenSea, Solanart, Solsea or Magic
   "marketplace": "opensea",                         # string: one of: opensea, solanart, solsea or magiceden
   "name": "ethereum",                               # string: collection name/id from source
   "color": true,                                    # bool/OPTIONAL: requires nickname
+  "arrows": true,                                   # bool/OPTIONAL: add price arrows
   "activity": "Hello;Its;Me",                       # string/OPTIONAL: list of strings to show in activity section
   "nickname": true,                                 # bool/OPTIONAL: display information in nickname vs activity
   "activity": "Hello;Its;Me",                       # string/OPTIONAL: list of strings to show in activity section

floor.go

@@ -21,6 +21,7 @@ type Floor struct {
 	Activity    string   `json:"activity"`
 	Frequency   int      `json:"frequency"`
 	Color       bool     `json:"color"`
+	Arrows      bool     `json:"arrows"`
 	Activity    string   `json:"activity"`
 	ClientID    string   `json:"client_id"`
 	Token       string   `json:"discord_bot_token"`
@@ -122,12 +123,21 @@ func (f *Floor) watchFloorPrice() {
 				increase = false
 			}
 
+			// Add arrows to price if requested
+			var decorator string
+			if f.Arrows {
+				decorator = "⬊"
+				if increase {
+					decorator = "⬈"
+				}
+			}
+
 			// change nickname
 			if f.Nickname {
 
 				for _, gu := range guilds {
 
-					err = dg.GuildMemberNickname(gu.ID, "@me", price)
+					err = dg.GuildMemberNickname(gu.ID, "@me", fmt.Sprintf("%s %s", decorator, price))
 					if err != nil {
 						logger.Errorf("Error updating nickname: %s\n", err)
 						continue