Bump NPM to v7 (#389)

* Try bumping npm again

* Add NPM requirement to readme

.github/workflows/build.yml

@@ -32,6 +32,12 @@ jobs:
         with:
           node-version: '14'
 
+      - name: Update NPM
+        run: |
+          npm install -g npm@7
+          npm install -g node-gyp
+          node-gyp install $(node -v)
+
       - name: Print environment
         run: |
           node --version

README.md

@@ -6,6 +6,7 @@ Common code referenced across Bitwarden JavaScript projects.
 
 ## Requirements
 * [Node.js](https://nodejs.org) v14.17 or greater
+* NPM v7
 * Git
 * node-gyp
 

package.json

@@ -99,6 +99,6 @@
   },
   "engines": {
     "node": "~14",
-    "npm": "~6"
+    "npm": "~7"
   }
 }