ci(kitchen+travis): modify matrix to include `develop` platform

* Use balanced matrix based on `template-formula` guidelines
* Initial ref: https://github.com/saltstack-formulas/template-formula/issues/118

# [0.4.0](https://github.com/saltstack-formulas/ufw-formula/compare/v0.3.0...v0.4.0) (2019-05-21)

### Continuous Integration

* **kitchen+travis:** test with pre-salted Docker images ([f27ec2e](https://github.com/saltstack-formulas/ufw-formula/commit/f27ec2e))

### Features

* **tofs:** switch to tofs ([c05019a](https://github.com/saltstack-formulas/ufw-formula/commit/c05019a))

Add tofs, use pre-salted images

# [0.3.0](https://github.com/saltstack-formulas/ufw-formula/compare/v0.2.0...v0.3.0) (2019-05-14)

### Continuous Integration

* **kitchen:** rename Kitchen config file ([2e59df4](https://github.com/saltstack-formulas/ufw-formula/commit/2e59df4))

### Features

* **semantic-release:** implement an automated changelog ([f25b404](https://github.com/saltstack-formulas/ufw-formula/commit/f25b404))

feat(semantic-release): implement an automated changelog

Allow multiple configurations for the same port

Also perform tests on bionic/18.04

Adds ability to limit or deny services and applications.

The "limit" and "deny" parameters have been added to both the services and
applications sections. Setting "limit: True" will use the "ufw limit" command
instead of "ufw allow". Likewise, setting "deny: True" will use the "ufw deny"
command.

Interface support