fix: require node v12.17+ due to dynamic import (previous was v12.11+)

Author: titanism

README.md

@@ -15,7 +15,7 @@
 </div>
 <hr />
 <div align="center">
-  Works in Node v12.11.0+, uses <a href="https://nodejs.org/api/worker_threads.html">worker threads</a> (Node.js) to spawn sandboxed processes, and supports <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function">async/await</a>, <a href="https://github.com/sindresorhus/p-retry">retries</a>, <a href="https://github.com/sindresorhus/p-throttle">throttling</a>, <a href="#concurrency">concurrency</a>, and <a href="#cancellation-retries-stalled-jobs-and-graceful-reloading">cancelable jobs with graceful shutdown</a>.  Simple, fast, and lightweight.  <strong>Made for <a href="https://forwardemail.net">Forward Email</a> and <a href="https://lad.js.org">Lad</a></strong>.
+  Works in Node v12.17.0+, uses <a href="https://nodejs.org/api/worker_threads.html">worker threads</a> (Node.js) to spawn sandboxed processes, and supports <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function">async/await</a>, <a href="https://github.com/sindresorhus/p-retry">retries</a>, <a href="https://github.com/sindresorhus/p-throttle">throttling</a>, <a href="#concurrency">concurrency</a>, and <a href="#cancellation-retries-stalled-jobs-and-graceful-reloading">cancelable jobs with graceful shutdown</a>.  Simple, fast, and lightweight.  <strong>Made for <a href="https://forwardemail.net">Forward Email</a> and <a href="https://lad.js.org">Lad</a></strong>.
 </div>
 
 

UPGRADING.md

@@ -36,7 +36,7 @@ Here is a complete list of the underlying changes made:
 
 * ESM module support has been added (per [#180](https://github.com/breejs/bree/issues/180)) by using dynamic imports to load the job Array (CJS is still supported).
   * For a majority of users, you do not need to make any changes to your code for v9 to work when you upgrade from v8 (**with the exception of now having to do `await bree.start()`**).
-  * Top-level await support is added in Node v14.8+ (without requiring any Node flags), and therefore you can call `await bree.start();` (e.g. if your `package.json` has `"type": "module"` and/or the file extension you're running with Node is `.mjs`).  Note that Bree still works in Node v12.11+
+  * Top-level await support is added in Node v14.8+ (without requiring any Node flags), and therefore you can call `await bree.start();` (e.g. if your `package.json` has `"type": "module"` and/or the file extension you're running with Node is `.mjs`).  Note that Bree still works in Node v12.17+
   * The major difference is that Bree no longer initializes `this.config.jobs` in the constructor.
   * However we have dummy-proofed this new approach, and `bree.init()` will be invoked (if and only if it has not yet been invoked successfully) when you call `bree.start()` (or any similar method that accesses `this.config.jobs` internally).
   * Internal methods such as `validate` exported by `src/job-validator.js` are now asynchronous and return Promises (you do not need to worry about this unless you're doing something custom with these functions).

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bree",
-  "description": "The best job scheduler for Node.js and JavaScript with cron, dates, ms, later, and human-friendly support.  Works in Node v12.11.0+, uses worker threads to spawn sandboxed processes, and supports async/await, retries, throttling, concurrency, and cancelable promises (graceful shutdown).  Simple, fast, and lightweight.  Made for Forward Email and Lad.",
+  "description": "The best job scheduler for Node.js and JavaScript with cron, dates, ms, later, and human-friendly support.  Works in Node v12.17.0+, uses worker threads to spawn sandboxed processes, and supports async/await, retries, throttling, concurrency, and cancelable promises (graceful shutdown).  Simple, fast, and lightweight.  Made for Forward Email and Lad.",
   "version": "9.1.0",
   "author": "Nick Baugh <[email protected]> (http://niftylettuce.com/)",
   "bugs": {
@@ -50,7 +50,7 @@
     "xo": "^0.50.0"
   },
   "engines": {
-    "node": ">= 12.11"
+    "node": ">= 12.17"
   },
   "files": [
     "src",