Update grunt package

```
npm i -g grunt-init
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated minimatch@0.3.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated graceful-fs@1.2.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.
/usr/local/bin/grunt-init -> /usr/local/lib/node_modules/grunt-init/bin/grunt-init
```

```
➜ npm ls -g minimatch
/usr/local/lib
├─┬ grunt-init@0.3.2
│ └─┬ grunt@0.4.5
│ ├─┬ findup-sync@0.1.3
│ │ └─┬ glob@3.2.11
│ │ └── minimatch@0.3.0
│ └── minimatch@0.2.14
```

```
➜ npm ls -g graceful-fs
/usr/local/lib
├─┬ grunt-init@0.3.2
│ └─┬ grunt@0.4.5
│ └─┬ glob@3.1.21
│ └── graceful-fs@1.2.3
```

Please update grunt package