handling of pip3 on CentOS 8

.travis.yml

@@ -10,7 +10,7 @@ env:
     - MOLECULE_DISTRO: centos8
       MOLECULE_PLAYBOOK: playbook-plugin-install.yml
     - MOLECULE_DISTRO: centos8
-      MOLECULE_PLAYBOOK: playbook-pip-install.yml
+      MOLECULE_PLAYBOOK: playbook-pip3-install.yml
     - MOLECULE_DISTRO: centos7
     - MOLECULE_DISTRO: centos7
       MOLECULE_PLAYBOOK: playbook-plugin-install.yml

molecule/default/playbook-pip3-install.yml

@@ -0,0 +1,33 @@
+---
+- name: Converge
+  hosts: all
+  become: true
+
+  vars:
+    certbot_auto_renew_user: root
+
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=yes cache_valid_time=600
+      when: ansible_os_family == 'Debian'
+      changed_when: false
+
+    - name: Install dependencies (RedHat).
+      yum: name={{ item }} state=present
+      with_items:
+        - cronie
+        - epel-release
+      when: ansible_os_family == 'RedHat'
+
+    - name: Install cron (Debian).
+      apt: name=cron state=present
+      when: ansible_os_family == 'Debian'
+
+  roles:
+    - role: geerlingguy.pip
+      pip_package: python3-pip
+      pip_executable: pip3
+    - role: geerlingguy.certbot
+      certbot_install_from_source: false
+      certbot_pkg_mgr: pip3
+      certbot_plugins: ['dns-route53']