Bump node-pre-gyp version

Fixes compile issue caused by nodejs/node#21063 and mapbox/node-pre-gyp#391. See: mapbox/node-pre-gyp#408

Author: subtly

package.json

@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "nan": "~2.10.0",
-    "node-pre-gyp": "^0.10.3",
+    "node-pre-gyp": "^0.11.0",
     "request": "^2.87.0"
   },
   "devDependencies": {