Fixed IsZipFile

Forgot to include the default return case.

Author: imememani

Assets/Late Night Studios/ZipExtractor/Editor/UnityZipExtraction.cs

@@ -136,6 +136,9 @@ private static bool IsZipFile(string input)
                   return true;
               case "7z":
                   return true;
+                  
+              default:
+                  return false;
           }
         }
     }