Merge pull request #578 from jeremywen/patch-1

Update README.md

README.md

@@ -29,7 +29,7 @@ Install [CMake](https://cmake.org/) (for some of Rack's dependencies) and wget,
 Install [MSYS2](http://www.msys2.org/) and launch the mingw64 shell (not the default msys2 shell).
 Install build dependencies with the pacman package manger.
 
-	pacman -S git make tar unzip mingw-w64-x86_64-gcc mingw-w64-x86_64-cmake
+	pacman -S git make tar zip unzip mingw-w64-x86_64-gcc mingw-w64-x86_64-cmake
 
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