more compact file, and slightly faster

[pablovaldes]

time echo version-$(grep -Eohm1 2[0-9-]{9} quicklisp.lisp) -> version-2015-01-28

real 0m0,005s user 0m0,000s sys 0m0,000s

time echo version-grep 'defvar qlqs-info:.version.' quicklisp.lisp | cut -d\" -f 2 -> version-2015-01-28

real 0m0,010s

time echo version-$(grep 'defvar qlqs-info:.version.' quicklisp.lisp | cut -d" -f 2) version-2015-01-28

real 0m0,066s

time echo version-grep -Eohm1 2[0-9-]{9} quicklisp.lisp version-2015-01-28

real 0m0,073s