chartEnabled=trueでfont.ttfが配置されていない場合は異常終了する #107
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Fix #110
font.ttf
を配置せずにchartEnabled: true
な状態で起動すると、チャート機能実行時に上記エラーで落ちます。従って、
chartEnabled: true
な場合はbot起動前にfont.ttf
が配置されているか確認し、入っていなかったら落ちるようにします。また、READMEの記述にわかりづらい箇所があったため、合わせて修正しています。