chore(gitattributes): Add "hex" diff tag to binary files (#1367)
chore(gitattributes): Add "hex" diff tag to binary files (#1367)

This adds a `diff` tag to binary files in `.gitattributes`,
enabling git to use an external tool to generate diffable output for binary files
by adding a handler to the local or global git config, i.e:

```
[diff "hex"]
  textconv = hexdump
  binary = true
```

Change-Type: patch
resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/resin-etcher,resin-io/herostratus,resin-io/resin-etcher,resin-io/etcher,resin-io/herostratus,resin-io/etcher