2.2.0: Upgrade PHP 7.0 -> 7.1

1. Fix No package matching 'php70u-*' fails on CentOS 7. #25

2.1.6: Fixed YAML_ERROR: too many blank lines (1 > 0) on Galaxy

1. Fixed YAML_ERROR: too many blank lines (1 > 0) (empty-lines) on Galaxy. #23

2.1.2: Improve via ansible-lint 4.1.0

1. Unify use list vars of yum name. #20
2. Improve via ansible-lint 4.1.0.
3. Fixed "Add third-party repository" task failed on Ubuntu 16.04 #22
4. Support the Ubuntu 18.04.

2.1.1: Refactor install yum packages loop

1. Fixed deprecation errors thrown with Ansible 2.7 #20
2. Refactor the Travis CI script with variables.

2.1.0: Add php_expose_php variable

1. Add php_expose_php vars for switch enable/disable expose php version.
2. Default disable exposing the php version.

2.0.0: Refactor with Ansible 2.4+

1. Use the include_tasks and import_tasks to replace include module.
2. Refactor by key : value mode.
3. Refactor the setup epel, remi and ius tasks for CentOS.
4. Optimizing with ansible-lint.
5. Support Vagrant 2.0+ and Ubuntu 16.04.

1.3.8: Fix README

Just modify some indent of markdown syntax.

1.3.7: apt_php_third_party_repo is better

use apt_php_third_party_repo, not apt_php_official_repo to switch the third-party repository.

1.3.6: add apt_php_official_repo varible

This is a switch of enable or disable third-party repository, and default vaule is false.

1. apt_php_official_repo == true: use the official repository.
2. apt_php_official_repo == false: use the third-party repository.

1.3.5: Support the Debian 9

Fixed the issue #17 and support the Debian 9 (Stretch).