Fix new linter errors

lib/util.js

@@ -398,7 +398,7 @@ function parseGitHubUrl(inputUrl) {
     try {
         url = new URL(inputUrl);
     }
-    catch (e) {
+    catch {
         throw new ConfigurationError(`"${originalUrl}" is not a valid URL`);
     }
     // If we detect this is trying to be to github.com
@@ -576,7 +576,7 @@ function doesDirectoryExist(dirPath) {
         const stats = fs.lstatSync(dirPath);
         return stats.isDirectory();
     }
-    catch (e) {
+    catch {
         return false;
     }
 }