adding "when" statement to only do steps if there has been a change in the get_url step

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

@@ -4,27 +4,33 @@
   get_url: >
     url={{ browsermob_proxy_url }}
     dest=/var/tmp/browsermob-proxy-{{ browsermob_proxy_version }}.zip
+  register: download_browsermob_proxy
 
 - name: unzip into /var/tmp/
   shell: >
     unzip /var/tmp/browsermob-proxy-{{ browsermob_proxy_version }}.zip
     chdir=/var/tmp
+  when: download_browsermob_proxy.changed
 
 - name: move to /etc/browsermob-proxy/
   shell: > 
     mv /var/tmp/browsermob-proxy-{{ browsermob_proxy_version }} /etc/browsermob-proxy
+  when: download_browsermob_proxy.changed
 
 - name: change permissions of main script
   file: >
     path=/etc/browsermob-proxy/bin/browsermob-proxy
     mode=0755
+  when: download_browsermob_proxy.changed
 
 - name: add wrapper script /usr/local/bin/browsermob-proxy
   copy: >
       src=browsermob-proxy
       dest=/usr/local/bin/browsermob-proxy
+  when: download_browsermob_proxy.changed
 
 - name: change permissions of wrapper script
   file: >
       path=/usr/local/bin/browsermob-proxy
       mode=0755
+  when: download_browsermob_proxy.changed