Fix typo in formatPurlErrorMessage

Author: jdalton

src/error.js

@@ -7,7 +7,7 @@ function formatPurlErrorMessage(message = '') {
     // Lower case start of message.
     const code0 = message.charCodeAt(0)
     formatted =
-      code0 >= 65 /*'A'*/ || code0 <= 90 /*'Z'*/
+      code0 >= 65 /*'A'*/ && code0 <= 90 /*'Z'*/
         ? `${message[0].toLowerCase()}${message.slice(1)}`
         : message
     // Remove period from end of message.