Update Cargo.toml instructions in README.md (#32)

reillysiemens · web-flow · commit cfad8e944584 · 2020-03-14T20:34:52.000-07:00
diff --git a/README.md b/README.md
@@ -18,7 +18,7 @@ Add the dependency to your `Cargo.toml`:
 ```toml
 [dependencies]
 log = "0.4"
-pretty_env_logger = "0.3"
+pretty_env_logger = "0.4"
 ```
 
 Add some usage to your application:
