Update README.md

Author: bobbui

README.md

@@ -45,8 +45,7 @@ Install by running this command:
 > pip install json-logging
 
 By default log will be emitted in normal format to ease the local development. To enable it on production set
-enable_json in init_\<framework name\>(enable_json=True) method call (set **json_logging.ENABLE_JSON_LOGGING** or **
-ENABLE_JSON_LOGGING environment variable** to true is not recommended and will be deprecated in future versions).
+enable_json in init_\<framework name\>(enable_json=True) method call.
 
 To configure, call **json_logging.init_< framework_name >()**. Once configured library will try to configure all
 loggers (existing and newly created) to emit log in JSON format.