Feature request: Add deoplete matcher filter

[bb010g]

For comparison:

• denite: https://github.com/Shougo/denite.nvim/blob/609c85797a5f6acc2e2357cf56e7f6c78c561145/rplugin/python3/denite/filter/matcher/cpsm.py
• Deoplete: https://github.com/Shougo/deoplete.nvim/blob/bbec852adee45a1500fa817a3c17889dc328cad0/rplugin/python3/deoplete/filter/matcher_cpsm.py

They're pretty similar, aside from matcher_fruzzy instead of matcher/fruzzy. :)