fix typo in readme.md (#2337)

kenzieschmoll · web-flow · commit 43db4f4bb378 · 2020-09-14T08:35:30.000-07:00
diff --git a/tool/README.md b/tool/README.md
@@ -87,7 +87,7 @@ dart bin/devtools.dart
 #### Publish the packages
 
 ```shell
-./too/pub_publish.sh
+./tool/pub_publish.sh
 ```
 
 #### Revert the change to .gitignore and pubspec files
