Add support for Twilio alerts (#7)

core/alert.go

@@ -19,5 +19,6 @@ type AlertType string
 
 const (
 	SlackAlert  AlertType = "slack"
+	TwilioAlert AlertType = "twilio"
 	CustomAlert AlertType = "custom"
 )

core/alerting.go

@@ -10,9 +10,17 @@ import (
 
 type AlertingConfig struct {
 	Slack  string               `yaml:"slack"`
+	Twilio *TwilioAlertProvider `yaml:"twilio"`
 	Custom *CustomAlertProvider `yaml:"custom"`
 }
 
+type TwilioAlertProvider struct {
+	SID   string `yaml:"sid"`
+	Token string `yaml:"token"`
+	From  string `yaml:"from"`
+	To    string `yaml:"to"`
+}
+
 type CustomAlertProvider struct {
 	Url     string            `yaml:"url"`
 	Method  string            `yaml:"method,omitempty"`