Also build for freebsd-386 (fixes #458)

build.sh

@@ -157,7 +157,7 @@ case "$1" in
 		test -short || exit 1
 		assets
 
-		for os in darwin-amd64 linux-386 linux-amd64 freebsd-amd64 windows-amd64 windows-386 solaris-amd64 ; do
+		for os in darwin-amd64 freebsd-amd64 freebsd-386 linux-amd64 linux-386 windows-amd64 windows-386 solaris-amd64 ; do
 			export GOOS=${os%-*}
 			export GOARCH=${os#*-}