ensureLink(srcpath, dstpath, [callback])

Ensures that the link exists. If the directory structure does not exist, it is created.

- `srcpath` `<String>`
- `dstpath` `<String>`
- `callback` `<Function>`

# Example:

const fs = require('fs-extra')
const srcpath = '/tmp/file.txt'
const dstpath = '/tmp/this/path/does/not/exist/file.txt'
fs.ensureLink(srcpath, dstpath, err => {
console.log(err) // => null
// link has now been created, including the directory it is to be placed in
})
// With Promises:
fs.ensureLink(srcpath, dstpath)
.then(() => {
console.log('success!')
})
.catch(err => {
console.error(err)
})