docs: mention dropping support of Node.js 10 in the migration guide

Author: haoqunjiang

docs/migrations/migrate-from-v4.md

@@ -36,7 +36,7 @@ If you want to migrate manually and gradually, you can run `vue upgrade <the-plu
 
 ### For All Packages
 
-* Drop support of Node.js 8, 11, 13
+* Drop support of Node.js 8-11 and 13
 * Drop support of NPM 5
 
 ### The `vue` Command (The Global `@vue/cli` Package)