feat: always specify required Node version

@xen-orchestra/babel-config/package.json

@@ -8,5 +8,8 @@
     "directory": "@xen-orchestra/babel-config",
     "type": "git",
     "url": "https://github.com/vatesfr/xen-orchestra.git"
+  },
+  "engines": {
+    "node": ">=6"
   }
 }

packages/xo-server-test-plugin/package.json

@@ -8,5 +8,8 @@
     "directory": "packages/xo-server-test-plugin",
     "type": "git",
     "url": "https://github.com/vatesfr/xen-orchestra.git"
+  },
+  "engines": {
+    "node": "*"
   }
 }

scripts/normalize-packages

@@ -31,6 +31,10 @@ require('exec-promise')(() =>
     if (!('version' in pkg)) {
       pkg.version = '0.0.0'
     }
+    pkg.engines = {
+      node: '>=8.10',
+      ...pkg.engines,
+    }
 
     delete pkg.husky
     delete pkg.standard