Identify Sony and Canon raw images as subtypes of image/tiff #89
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For Sony and Canon Raw file formats. They are based on the tiff format
and have the same magic number data so they are incorrectly classified
as tiff images.
Defining them as subtypes of tiff solves this issue:
```ruby
Marcel::MimeType.for Pathname.new("/Users/afcapel/Downloads/RAW_SONY_ILCE-7M2.ARW"), name: "/Users/afcapel/Downloads/RAW_SONY_ILCE-7M2.ARW"
=> "image/x-raw-sony"
```
jeremy
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For Sony and Canon Raw file formats. They are based on the tiff format and have the same magic number data so they are incorrectly classified as tiff images.
Defining them as subtypes of tiff solves this issue: