Fix wrong path to logo image of CoderDojo 松本

Author: yasulab

db/dojos.yaml

@@ -939,7 +939,7 @@
   name: 松本 (中部)
   prefecture_id: 20
   url: https://pro.form-mailer.jp/lp/2a6ae9f9153606
-  logo: "/img/dojos/matsumoto.jpg"
+  logo: "/img/dojos/matsumoto.png"
   description: 長野県松本市で毎月開催
   tags:
   - Scratch