Normalize description across readme, repo and package.json

Author: jasonkarns

README.md

@@ -1,6 +1,6 @@
 # nodenv-update
 
-[nodenv][] plugin to update nodenv and installed plugins
+A [nodenv][] plugin to update nodenv and installed plugins.
 
 [![Tests](https://img.shields.io/github/actions/workflow/status/nodenv/nodenv-update/test.yml?label=tests&logo=github)](https://github.com/nodenv/nodenv-update/actions/workflows/test.yml)
 [![Latest GitHub Release](https://img.shields.io/github/v/release/nodenv/nodenv-update?label=github&logo=github&sort=semver)](https://github.com/nodenv/nodenv-update/releases/latest)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@nodenv/nodenv-update",
   "version": "1.0.0",
-  "description": "nodenv plugin for updating nodenv and all nodenv plugins",
+  "description": "A nodenv plugin to update nodenv and installed plugins.",
   "homepage": "https://github.com/nodenv/nodenv-update#readme",
   "license": "MIT",
   "contributors": [