Fix invalid highlighting '::' in binaries

[syohex]

Append space to map key regex because keyword argument must be followed by space.

This is related to #320.
CC: @tonini @whatyouhide

[tonini]

Thanks a lot @syohex ❤️ 💛 💙

Thanks @whatyouhide for the great report. 👍

[whatyouhide]

Oh no worries, thanks for the quick handling @tonini and the superquick solving @syohex 😃