docs: update to reflect node versions (#151)

* docs: update readme to reflect node versions

Signed-off-by: Chapman Pendery <cpendery@vt.edu>

* docs: add engines flag to specify supported versions

Signed-off-by: Chapman Pendery <cpendery@vt.edu>

---------

Signed-off-by: Chapman Pendery <cpendery@vt.edu>

README.md

@@ -8,7 +8,7 @@
 
 ### Requirements
 
-- `node >= 16.x`
+- `20.x >= node >= 16.x`
 - node-gyp dependencies installed for your platform (see [node-gyp](https://github.com/nodejs/node-gyp) for more details)
 
 ### Installation

package.json

@@ -3,6 +3,9 @@
   "version": "0.0.1-rc.7",
   "description": "IDE style command line auto complete",
   "type": "module",
+  "engines": {
+    "node" : ">=16.6.0 <21.0.0"
+  },
   "bin": {
     "inshellisense": "./build/index.js",
     "is": "./build/index.js"