docs: set npm version and recommend corepack

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v2
         with:
-          node-version: '14'
+          node-version-file: 'package.json'
 
       - uses: actions/checkout@v2
       - run: |

README.md

@@ -4,9 +4,15 @@
 
 Break screen channels for displaying and reacting to donations and donation totals during mainline Games Done Quick and Frame Fatales broadcasts.
 
+It is recommended to use `corepack` if it's available in your Node.js installation.
+
+- Check if it is available with `corepack --version`
+- Enable it with `corepack enable npm yarn pnpm`.
+
 ## Requirements
 
 - Node v14
+- npm@6.x.x
 
 While other Node versions may work for this project, we use and deploy against Node v14 due to some dependencies of our current layout system (Pratchett).
 
@@ -40,4 +46,4 @@ Designed & developed by [Support Class](https://supportclass.net)
 
 - [Chris Hanel](https://twitter.com/ChrisHanel)
 - [Dillon Pentz](https://twitter.com/Dillon_Pentz)
-- [Melanie Arnold](https://github.com/einalem4)
+- [Melanie Arnold](https://github.com/einalem4)

package.json

@@ -4,6 +4,11 @@
   "description": "Donation Total Channels for GDQ Broadcasts",
   "author": "",
   "license": "Apache-2.0",
+  "packageManager": "npm@6.14.18",
+  "engines": {
+    "node": "^14.19.0",
+    "npm": "6"
+  },
   "files": [
     "src/",
     "tsconfig.json"