fix: make logFile optional in config

Author: Matsuuu

packages/openapi-ts/src/types/config.d.ts

@@ -195,7 +195,7 @@ export interface UserConfig {
   /**
    * Whether or not error logs should be written to a file or not
    * */
-  logFile: boolean;
+  logFile?: boolean;
   /**
    * Regenerate the client when the input file changes? You can alternatively
    * pass a numeric value for the interval in ms.