Support pre-release <major>.<minor> MacVim release version scheme

Author: ychin

scripts/extract_macvim_version

@@ -4,6 +4,6 @@ set -e -o pipefail
 
 srcdir=$1
 
-macvim_release_number=`grep -A1 CFBundleVersion $srcdir/MacVim/Info.plist|tail -1|sed -E -e 's/^.*<string>([[:digit:]]+).*/\1/'`
+macvim_release_number=`grep -A1 CFBundleVersion $srcdir/MacVim/Info.plist|tail -1|sed -E -e 's/^.*<string>([0-9.]+)<.*/\1/'`
 
 echo "$macvim_release_number"