INSTALL.md: add command to install avtranscoder devel version

Clement Champetier · Clement Champetier · commit 104556ff06a1 · 2015-04-24T18:56:40.000+02:00
diff --git a/INSTALL.md b/INSTALL.md
@@ -52,11 +52,18 @@ cmake .. -DCMAKE_BUILD_TYPE=Release/Debug
 http://brew.sh/
 
 ###### Install avTranscoder
+Last stable version:
 ```
 brew tap cbenhagen/video
 brew install avtranscoder
 ```
 
+From develop branch:
+```
+brew tap cbenhagen/video
+brew install avtranscoder --devel
+```
+
 ###### Use homebrew to install only dependencies
 ```
 brew deps avtranscoder
