fix: make callout detection case-insensitive (closes #171)

Jacky Zhao

2022-08-05 5c76d8dad9d993010c4e57c6de4e90911a3cd11a

 .prettierrc

@@ -2,5 +2,6 @@
  "printWidth": 100,
  "quoteProps": "as-needed",
  "trailingComma": "all",
  "tabWidth": 2
  "tabWidth": 2,
  "semi": false
}