Update README.md

Homebrew has `webp` library, but google developers didn't write about this
livelink · Dec 6, 2013 · 2cbd515 · 2cbd515
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Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -21,13 +21,13 @@ For Ubuntu, Debian:
 
 For Mac OS:
 
-    brew install libjpg libpng libtiff
+    brew install libjpg libpng libtiff webp
 
 or (for MacPorts):
 
     sudo port install jpeg libpng tiff
 
-Next, you should [install libwebp](https://developers.google.com/speed/webp/docs/compiling). This gem is not support Windows systems (sorry).
+Next, if you did not use `brew` you should [install libwebp](https://developers.google.com/speed/webp/docs/compiling). This gem is not support Windows systems (sorry).
 
 ### Final part