Remove PHP 5.6 and take off supported versions listing.

Author: geerlingguy

.travis.yml

@@ -6,7 +6,6 @@ env:
   - php_version: '7.3'
   - php_version: '7.2'
   - php_version: '7.1'
-  - php_version: '5.6'
 
 install:
   # Install Ansible.

README.md

@@ -15,7 +15,6 @@ Currently maintained versions include:
   - `7.3`, `7.3.x`, `latest`: PHP 7.3.x
   - `7.2`, `7.2.x`: PHP 7.2.x
   - `7.1`, `7.1.x`: PHP 7.1.x
-  - `5.6`, `5.6.x`: PHP 5.6.x
 
 ## Standalone Usage