add a section on upgrading to the latest lint set to the readme (dart-lang/lints#171)

pkgs/lints/CHANGELOG.md

diff --git a/pkgs/lints/CHANGELOG.md b/pkgs/lints/CHANGELOG.md
index 11978f7..0b76fbc 100644
--- a/pkgs/lints/CHANGELOG.md
+++ b/pkgs/lints/CHANGELOG.md
@@ -3,6 +3,7 @@
 - `core`:
   - added `no_wildcard_variable_uses`
 - Updated the SDK lower-bound to 3.1.
+- Add a section on upgrading to the latest lint set to the readme.
 
 ## 3.0.0
 

pkgs/lints/README.md

diff --git a/pkgs/lints/README.md b/pkgs/lints/README.md
index 7349a5d..c43af1c 100644
--- a/pkgs/lints/README.md
+++ b/pkgs/lints/README.md
@@ -71,6 +71,14 @@
     include: package:lints/core.yaml
     ```
 
+## Upgrading to the latest lints
+
+To upgrade to the latest version of the lint set, run:
+
+```
+dart pub add dev:lints
+```
+
 ## Customizing the predefined lint sets
 
 For details on customizing static analysis above and beyond the predefined