Breaking: Upgrade yeoman dependencies to latest (#101)

* Breaking: Upgrade yeoman dependencies to latest

Significantly modernizes code and tests.
Significantly improves test coverage.

* Chore: Recreate package-lock.json

* Chore: Run CI with latest NPM version

With the latest yeoman dependencies,  I was seeing errors under Node 12/14, unless NPM 7 was used to install dependencies:

- Uncaught Error: Cannot find module 'rimraf'
- Uncaught Error: Cannot find module 'mkdirp'

.github/workflows/ci.yml

@@ -35,6 +35,8 @@ jobs:
     - uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node }}
+    - name: Install latest NPM
+      run: npm install -g npm@latest
     - name: Install dependencies
       run: npm ci
     - name: Run tests

app/index.js

@@ -10,7 +10,7 @@
 // Requirements
 //------------------------------------------------------------------------------
 
-const yeoman = require("yeoman-generator");
+const Generator = require("yeoman-generator");
 
 //------------------------------------------------------------------------------
 // Helpers
@@ -25,19 +25,16 @@ const NAMESPACES = {
 // Constructor
 //------------------------------------------------------------------------------
 
-module.exports = yeoman.Base.extend({
-    prompting() {
-        const done = this.async();
-
-        this.prompt({
+module.exports = class extends Generator {
+    async prompting() {
+        const answers = await this.prompt({
             type: "list",
             name: "outputType",
             message: "Do you want to generate a rule or a plugin?",
             choices: ["Rule", "Plugin"],
             default: "Rule"
-        }, answers => {
-            this.composeWith(NAMESPACES[answers.outputType]);
-            done();
         });
+
+        this.composeWith(NAMESPACES[answers.outputType]);
     }
-});
+};