chore: Fix typo in default error message: "occured" → "occurred"#12

tsuchiya-yu wants to merge 1 commit intomicrocmsio:mainmicrocmsio/microcms-ruby-sdk:mainfrom

tsuchiya-yu:chore/typo-occurredtsuchiya-yu/microcms-ruby-sdk:chore/typo-occurredCopy head branch name to clipboard