fix(react-email): Path on Windows (unlayer#368)

Author: amar-jay

packages/react-email/source/utils/constants.ts

@@ -8,7 +8,7 @@ export const PACKAGE_NAME = 'react-email';
 export const CURRENT_PATH = process.cwd();
 
 // Client paths
-export const CLIENT_PACKAGE_JSON = `${CURRENT_PATH}/package.json`;
+export const CLIENT_PACKAGE_JSON = path.join(CURRENT_PATH, "package.json");
 
 // React Email paths
 export const REACT_EMAIL_ROOT = path.join(CURRENT_PATH, '.react-email');