feat: Drop support for node 10 (#930)

BREAKING CHANGE: node 10 is no longer supported. It reached its end-of-life on 30.04.2021.

.codesandbox/ci.json

@@ -1,3 +1,4 @@
 {
-  "sandboxes": ["new", "github/kentcdodds/react-testing-library-examples"]
+  "sandboxes": ["new", "github/kentcdodds/react-testing-library-examples"],
+  "node": "12"
 }

.github/workflows/validate.yml

@@ -17,7 +17,7 @@ jobs:
     if: ${{ !contains(github.head_ref, 'all-contributors') }}
     strategy:
       matrix:
-        node: [10.13, 12, 14, 16]
+        node: [12, 14, 16]
         react: [latest, next, experimental]
     runs-on: ubuntu-latest
     steps:

package.json

@@ -6,7 +6,7 @@
   "types": "types/index.d.ts",
   "module": "dist/@testing-library/react.esm.js",
   "engines": {
-    "node": ">=10"
+    "node": ">=12"
   },
   "scripts": {
     "prebuild": "rimraf dist",