chore: set engine version

2021-04-01 09:15:28 +02:00 · 2021-04-01 09:15:28 +02:00 · e348db6974
--- a/.tool-versions
+++ b/.tool-versions
@ -0,0 +1 @@
+nodejs 15.8.0
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@ -48,5 +48,9 @@
    "stylelint-config-standard": "^21.0.0",
    "stylelint-prettier": "^1.2.0",
    "stylelint-scss": "^3.19.0"
+  },
+  "engines": {
+    "node": "~15.8.0",
+    "npm": "~7.5.4"
  }
 }