change node and npm engine requirements

Author: george

package.json

@@ -107,8 +107,8 @@
     "yargs": "^13.2.2"
   },
   "engines": {
-    "node": ">=10.0.0",
-    "npm": ">=6.9.0"
+    "node": ">=9.0.0",
+    "npm": ">=6.0.0"
   },
   "keywords": [
     "scss",