message: Make travis build pnm instead of ppm
diff: @@ -17,7 +17,7 @@ env:
  - FEATURES='gif_codec'
  - FEATURES='jpeg'
  - FEATURES='png_codec'
  - - FEATURES='ppm'
  + - FEATURES='pnm'
  - FEATURES='tga'
  - FEATURES='tiff'
  - FEATURES='webp'
  