Update env_logger to 0.10.0 in README example

README.md

@@ -19,7 +19,7 @@ It must be added along with `log` to the project dependencies:
 ```toml
 [dependencies]
 log = "0.4.0"
-env_logger = "0.9.0"
+env_logger = "0.10.0"
 ```
 
 `env_logger` must be initialized as early as possible in the project. After it's initialized, you can use the `log` macros to do actual logging.