Update molecule configuration to work with 3.0.

.yamllint

@@ -0,0 +1,6 @@
+---
+extends: default
+rules:
+  line-length:
+    max: 120
+    level: warning

molecule/default/converge.yml

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+---
+- name: Converge
+  hosts: all
+  become: true
+
+  vars:
+    php_enable_webserver: false
+    php_enable_php_fpm: true
+    php_memory_limit: "192M"
+    php_enablerepo: "remi,remi-php70"
+    php_install_recommends: false
+
+  handlers:
+    - name: update apt cache
+      apt: update_cache=true
+      when: ansible_os_family == 'Debian'
+
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=true cache_valid_time=600
+      when: ansible_os_family == 'Debian'
+      changed_when: false
+
+    # Ubuntu-specific tasks.
+    - name: Add repository for PHP 7.
+      apt_repository: repo='ppa:ondrej/php'
+      when: ansible_distribution == 'Ubuntu'
+
+    # Debian-specific tasks.
+    - name: Add dependencies for PHP versions (Debian).
+      apt:
+        name:
+          - apt-transport-https
+          - ca-certificates
+        state: present
+      when: ansible_distribution == "Debian"
+
+    - name: Add Ondrej Sury's apt key (Debian).
+      apt_key:
+        url: https://packages.sury.org/php/apt.gpg
+        state: present
+      when: ansible_distribution == "Debian"
+
+    - name: Add Ondrej Sury's repo (Debian).
+      apt_repository:
+        repo: "deb https://packages.sury.org/php/ {{ ansible_distribution_release }} main"
+        state: present
+      when: ansible_distribution == "Debian"
+      notify: update apt cache
+
+    - meta: flush_handlers
+
+  roles:
+    - role: geerlingguy.repo-remi
+      when:
+        - ansible_os_family == 'RedHat'
+        - ansible_distribution != 'Fedora'
+    - role: geerlingguy.php
+
+  post_tasks:
+    - name: Confirm PHP configuration is correct.
+      shell: php -i | grep 'memory_limit.*192'
+      changed_when: false