Update README.md

Author: elapse-d

README.md

@@ -57,7 +57,7 @@ back4.sh gif/pixel.gif-0.010 &
 rm -rf /tmp/back4
 ```
 
-# If you have big git , you must change config in ImageMagick policy example:
+# If you have big gif , you must change config in ImageMagick policy example:
 ```
 sudo sed -i s'@<policy domain="resource" name="memory" value=".*"/>@<policy domain="resource" name="memory" value="2GiB"/>@'g /etc/ImageMagick-6/policy.xml
 ```