Add engine to strict node version in package.json (#144)

Signed-off-by: inductor <kohei.ota@zozo.com>
Signed-off-by: Cody Belcher <cody.t.belcher@gmail.com>

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

package.json

@@ -12,6 +12,9 @@
   "config": {
     "bundledKubectlVersion": "1.17.3"
   },
+  "engines": {
+    "node": ">=0.12 <0.13"
+  },
   "build": {
     "afterSign": "build/notarize.js",
     "extraResources": [