Add Guild Member Mute/Deaf Edit Support (#804)

* :sparkles: Add member edit deaf/mute support

* Resolve omitempty issues

restapi.go

@@ -834,10 +834,6 @@ func (s *Session) GuildMemberEdit(guildID, userID string, roles []string) (err e
 	}{roles}
 
 	_, err = s.RequestWithBucketID("PATCH", EndpointGuildMember(guildID, userID), data, EndpointGuildMember(guildID, ""))
-	if err != nil {
-		return
-	}
-
 	return
 }
 
@@ -848,16 +844,11 @@ func (s *Session) GuildMemberEdit(guildID, userID string, roles []string) (err e
 // NOTE : I am not entirely set on the name of this function and it may change
 // prior to the final 1.0.0 release of Discordgo
 func (s *Session) GuildMemberMove(guildID string, userID string, channelID *string) (err error) {
-
 	data := struct {
 		ChannelID *string `json:"channel_id"`
 	}{channelID}
 
 	_, err = s.RequestWithBucketID("PATCH", EndpointGuildMember(guildID, userID), data, EndpointGuildMember(guildID, ""))
-	if err != nil {
-		return
-	}
-
 	return
 }
 
@@ -865,6 +856,7 @@ func (s *Session) GuildMemberMove(guildID string, userID string, channelID *stri
 // guildID   : The ID of a guild
 // userID    : The ID of a user
 // userID    : The ID of a user or "@me" which is a shortcut of the current user ID
+// nickname  : The nickname of the member, "" will reset their nickname
 func (s *Session) GuildMemberNickname(guildID, userID, nickname string) (err error) {
 
 	data := struct {
@@ -879,6 +871,32 @@ func (s *Session) GuildMemberNickname(guildID, userID, nickname string) (err err
 	return
 }
 
+// GuildMemberMute server mutes a guild member
+//  guildID   : The ID of a Guild.
+//  userID    : The ID of a User.
+//  mute    : boolean value for if the user should be muted
+func (s *Session) GuildMemberMute(guildID string, userID string, mute bool) (err error) {
+	data := struct {
+		Mute bool `json:"mute"`
+	}{mute}
+
+	_, err = s.RequestWithBucketID("PATCH", EndpointGuildMember(guildID, userID), data, EndpointGuildMember(guildID, ""))
+	return
+}
+
+// GuildMemberDeafen server deafens a guild member
+//  guildID   : The ID of a Guild.
+//  userID    : The ID of a User.
+//  deaf    : boolean value for if the user should be deafened
+func (s *Session) GuildMemberDeafen(guildID string, userID string, deaf bool) (err error) {
+	data := struct {
+		Deaf bool `json:"deaf"`
+	}{deaf}
+
+	_, err = s.RequestWithBucketID("PATCH", EndpointGuildMember(guildID, userID), data, EndpointGuildMember(guildID, ""))
+	return
+}
+
 // GuildMemberRoleAdd adds the specified role to a given member
 //  guildID   : The ID of a Guild.
 //  userID    : The ID of a User.