Suggest ext-exif

[tomasfejfar]

Can be tested locally using project with composer.json like this:

{
    "name": "tomasfejfar/composer-test",
    "repositories": [{
        "type": "vcs",
        "url": "w:\\git\\php-exif" <------- your path here
    }],
    "require": {
        "miljar/php-exif": "dev-dev/suggest-ext-exif" <---- your local branch here
    }
}

Resulting in

Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing miljar/php-exif (dev-dev/suggest-ext-exif eda189b)
    Cloning eda189b6608db5ecfc8c2624bebfb9c895e02c6c

miljar/php-exif suggests installing lib-exiftool (Use perl lib exiftool as adapter)
miljar/php-exif suggests installing ext-exif (Use exif PHP extension as adapter) <------- suggestion
Writing lock file
Generating autoload files

Fixes #59

[Miljar]

Great work, thanks!