Add license to Cargo.toml

[JonasHedEng]

When using cargo deny, exr is reported to be missing a license and I guess the BSD-3 fails to get parsed out of the LICENSE file due to the Dreamworks section?

error[L003]: exr = 1.4.1 is unlicensed
  ┌─ exr 1.4.1 (registry+https://github.com/rust-lang/crates.io-index):2:9
  │
2 │ name = "exr"
  │         ^^^ a valid license expression could not be retrieved for the crate
3 │ version = "1.4.1"
4 │ license = ""
  │            - license expression was not specified
5 │ license-files = [
6 │     { path = "LICENSE.md", hash = 0xf0600744, score = 0.68, license = "Sleepycat" },
  │                                                       ---- low confidence in the license text
  │
  = exr v1.4.1
    └── image v0.24.1
        ├── ark-cli v0.1.1
        │   ├── ark-client v0.4.8
        │   │   ├── ark-client-android v0.2.0
        │   │   └── module-tests v0.1.0
        │   │       └── (dev) ark-module-publish v0.1.0
        │   │           └── ark-cli v0.1.1 (*)
        │   └── module-tests v0.1.0 (*)
        ├── ark-client v0.4.8 (*)
        ├── (dev) ark-render-vulkan v0.1.0
        │   ├── ark-cli v0.1.1 (*)
        │   └── ark-client v0.4.8 (*)
        └── ark-render-vulkan v0.1.0 (*)

So if there aren't any problems with it, additionally adding license = "BSD-3" should make cargo deny happier!

[johannesvollmer]

AcademySoftwareFoundation/openexr@a511caa

Seems like they changed it to BSD-3 recently, even confirming to SPDX. So I don't see any problem changing it too

[johannesvollmer]

crate was updated. image-rs might be updated soon too. see image-rs/image#1703

[JonasHedEng]

Perfect, thank you very much!