make v2 the migration version to codeberg (#2)

io.go

@@ -0,0 +1,13 @@
+package swayipc
+
+import "os"
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+
+	if err != nil {
+		return false
+	}
+
+	return !info.IsDir()
+}