fix: Use a single quoted string

Co-Authored-By: Lorenzo Gabriele <lorenzolespaul@gmail.com>

Author: mrfyda

src/main/scala/com/codacy/rules/ReportRules.scala

@@ -234,7 +234,7 @@ class ReportRules(coverageServices: => CoverageServices) extends StrictLogging {
     */
   private[rules] def handleFailedResponse(response: FailedResponse): String = {
     if (response.message.contains("not found")) {
-      """Request URL not found. (Check if the token you are using or the API base URL are valid)"""
+      "Request URL not found. (Check if the token you are using or the API base URL are valid)"
     } else {
       response.message
     }