Also install typescript which is a peer dep

PowerKiKi · plantain-00 · commit b316a57811cf · 2023-03-29T16:32:07.000+08:00
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ This tool will check type of all identifiers, `the type coverage rate` = `the co
 
 ## install
 
-`yarn global add type-coverage`
+`yarn global add type-coverage typescript`
 
 ## usage
 
