Bump bindings in /src/1-getting-started/1_hello_world/nan

Bumps [bindings](https://github.com/TooTallNate/node-bindings) from 1.2.1 to 1.5.0.
- [Release notes](https://github.com/TooTallNate/node-bindings/releases)
- [Commits](TooTallNate/node-bindings@v1.2.1...1.5.0)

---
updated-dependencies:
- dependency-name: bindings
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/1-getting-started/1_hello_world/nan/package.json

@@ -5,7 +5,7 @@
   "main": "hello.js",
   "private": true,
   "dependencies": {
-    "bindings": "~1.2.1",
+    "bindings": "~1.5.0",
     "nan": "^2.0.0"
   },
   "scripts": {