revert minimum node version upgrade in a minor update release

Author: mattberther

.github/workflows/unit-tests.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x]
+        node-version: [10.x, 12.x, 14.x, 16.x, 17.x]
 
     steps:
       - uses: actions/checkout@v2

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "types": "index.d.ts",
   "engines": {
-    "node": ">=12"
+    "node": ">=10"
   },
   "scripts": {
     "test": "mocha --ignore **/*.worker.js && eslint .",