Clean up how browsermob-proxy is downloaded

playbooks/roles/browsermob-proxy/defaults/main.yml

 # browsermob-proxy
 browsermob_proxy_version: '2.1.0-beta-4'
 browsermob_proxy_url: 'https://github.com/lightbody/browsermob-proxy/releases/download/browsermob-proxy-{{ browsermob_proxy_version }}/browsermob-proxy-{{ browsermob_proxy_version }}-bin.zip'
+browsermob_proxy_dir: '/etc/browsermob-proxy-{{browsermob_proxy_version}}'

playbooks/roles/browsermob-proxy/tasks/main.yml

 # Install browsermob-proxy, which is used for page performance testing with bok-choy
 ---
-- name: get zip file
+
+- name: Download the latest browsermob-proxy
   get_url: 
     url: "{{ browsermob_proxy_url }}" 
-    dest: "/var/tmp/browsermob-proxy-{{ browsermob_proxy_version }}.zip"
-  register: download_browsermob_proxy
+    dest: "/tmp/{{ browsermob_proxy_url | basename }}"
   tags:
     - install
     - install:system-requirements
 
-- name: unzip into /var/tmp/
-  shell:
-    unzip: "/var/tmp/browsermob-proxy-{{ browsermob_proxy_version }}.zip"
-    chdir: /var/tmp
-  when: download_browsermob_proxy.changed
-  tags:
-    - install
-    - install:system-requirements
-
-- name: move to /etc/browsermob-proxy/
-  shell: "mv /var/tmp/browsermob-proxy-{{ browsermob_proxy_version }} /etc/browsermob-proxy"
-  when: download_browsermob_proxy.changed
+- name: install browsermob-proxy
+  unarchive:
+    src: "/tmp/{{ browsermob_proxy_url | basename }}"
+    dest: "/etc"
+    creates: "{{ browsermob_proxy_dir }}"
+    copy: no
+  register: download_browsermob_proxy
   tags:
     - install
     - install:system-requirements
 
 - name: change permissions of main script
   file:
-    path: /etc/browsermob-proxy/bin/browsermob-proxy
+    path: "{{ browsermob_proxy_dir }}/bin/browsermob-proxy"
     mode: 0755
   when: download_browsermob_proxy.changed
   tags: