Fixed typo (specifiy -> specific)

Author: Ingwie Phoenix

README.md

@@ -12,7 +12,7 @@ It has a few advantages over bundling it as files:
 
 * No files are written to disk, it handle the files in memory
 * If files changed in watch mode, the middleware no longer serves the old bundle, but delays requests until the compiling has finished. You don't have to wait before refreshing the page after a file modification.
-* I may add some specifiy optimization in future releases.
+* I may add some specific optimization in future releases.
 
 ## Usage