Do not generate MD5 checksums

Issue #4

Signed-off-by: Michal Čihař <michal@cihar.com>

website/generate-missing-checksums

@@ -5,7 +5,7 @@
 cd /mnt/storage/files
 
 find . -name '*.bz2' -o -name '*.gz' -o -name '*.7z' -o -name '*.xz' -o -name '*.zip' | while read filename ; do
-        for hash in sha1 md5 sha256 ; do
+        for hash in sha1 sha256 ; do
                 if [ ! -f $filename.$hash ] ; then
                         pushd `dirname $filename`
                         base=`basename $filename`