Feature/partial match

[I-Dont-Remember]

Tackles issue #19 Filter as partial match.

Slight improvement would be to order results in increasing order of found index, so for :mus, :muscle: 💪 should appear before :unamused: 😒. Minimal gain for the effort though, probably saves 0.1s out of a users life, so decided not worth adding the extra implementation.

[chadlavi-casebook]

I literally just came to this repo because I thought an emoji was missing, but it turns out it's just not easy to find because of the issue you are fixing here (the use case is the white_check_mark emoji. :check does not show results for it currently)

[phibr0]

Thank you