[IMPR] Added commit type to commit template
[IMPR] Added commit type to commit template

This diff adds commit type to the template. This way we can easily
filter when creating release notes on what were the additional fixes,
features and improvements.

thumbor/thumbor,thumbor/thumbor,thumbor/thumbor,kkopachev/thumbor,scorphus/thumbor,gi11es/thumbor,gi11es/thumbor,kkopachev/thumbor,kkopachev/thumbor,thumbor/thumbor,kkopachev/thumbor,scorphus/thumbor,scorphus/thumbor,gi11es/thumbor,scorphus/thumbor