Chore: Prohibit small letters as the first character of report messages

Author: not-an-aardvark

.eslintrc.js

@@ -23,6 +23,6 @@ module.exports = {
   root: true,
   rules: {
     'require-jsdoc': 'error',
-    'eslint-plugin/report-message-format': ['error', '^[A-Z].*\\.$'],
+    'eslint-plugin/report-message-format': ['error', '^[^a-z].*\\.$'],
   },
 };