update package to work with ansible >= 2.9 (#7)

* Update install_packages_Debian.yml

Updated to fix:

[DEPRECATION WARNING]: Invoking "apt" only once while using a loop via squash_actions is deprecated. Instead of using a loop to supply multiple items and specifying `name: "{{ item }}"`, please use 
`name: ['git']` and remove the loop. This feature will be removed in version 2.11. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

* Update install_packages_RedHat.yml

Updated to fix

[DEPRECATION WARNING]: Invoking "yum" only once while using a loop via squash_actions is deprecated. Instead of using a loop to supply multiple items and specifying `name: "{{ item }}"`, please use 
`name: ['git']` and remove the loop. This feature will be removed in version 2.11. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

* Update main.yml

tasks/install_packages_Debian.yml

@@ -1,6 +1,7 @@
 ---
 - name: Install packages for Debian
-  apt: name={{ item }} state=present update_cache=yes cache_valid_time=86400
+  vars:
+    common_required_packages:
+      - git
+  apt: name={{ common_required_packages }} state=present update_cache=yes cache_valid_time=86400
   when: ansible_pkg_mgr == 'apt'
-  with_items:
-    - git

tasks/install_packages_RedHat.yml

@@ -1,6 +1,7 @@
 ---
 - name: Install dependency packages for RedHat
-  yum: name={{ item }} state=present
+  vars:
+    common_required_packages:
+      - git
+  yum: name={{ common_required_packages }} state=present
   when: ansible_pkg_mgr == 'yum'
-  with_items:
-    - git

tasks/main.yml

@@ -1,10 +1,10 @@
 ---
 - include: install_packages_Debian.yml
-  sudo: yes
+  become: yes
   when: ansible_os_family == 'Debian'
 
 - include: install_packages_RedHat.yml
-  sudo: yes
+  become: yes
   when: ansible_os_family == 'RedHat'
 
 - name: Clone liquidprompt