message: Add TGA to list of Supported Image Formats in README.md
diff: @@ -31,6 +31,7 @@ https://docs.rs/image
  | WebP | Lossy(Luma channel only) | No |
  | PNM | PBM, PGM, PPM, standard PAM | Yes |
  | DDS | DXT1, DXT3, DXT5 | No |
  +| TGA | Yes | No |
  ### 2.2 The `ImageDecoder` and `ImageDecoderExt` Traits
  