Replace description to correct one for Yachimata
Replace description to correct one for Yachimata

coderdojo-japan/coderdojo.jp,coderdojo-japan/coderdojo.jp,coderdojo-japan/coderdojo.jp,coderdojo-japan/coderdojo.jp,yasslab/coderdojo.jp,yasslab/coderdojo.jp,yasslab/coderdojo.jp