Add option to skip notification at the very first analysis of an image (#10)

internal/model/watch.go

@@ -2,6 +2,7 @@ package model
 
 // Watch holds data necessary for watch configuration
 type Watch struct {
-	Workers  int    `yaml:"workers,omitempty"`
-	Schedule string `yaml:"schedule,omitempty"`
+	Workers         int    `yaml:"workers,omitempty"`
+	Schedule        string `yaml:"schedule,omitempty"`
+	FirstCheckNotif bool   `yaml:"first_check_notif,omitempty"`
 }