Merge pull request #375 from nwoolls/bug/missing-windows-dll

Bugfix: document the need to package zlib1.dll for Windows

windows-build.txt

@@ -261,4 +261,5 @@ C:\MinGW\bin
 	libgpg-error-0.dll
 	libiconv-2.dll
 	libevent-2-0-5.dll
+	zlib1.dll