Elegent fail for htpasswd+stretch (#28 related)

tasks/install_Debian.yml

@@ -1,5 +1,13 @@
 ---
 
+- name: FAIL | Check possible issues
+  fail:
+    msg: "This ansible version ({{ ansible_version.full}}) is not compatible with your needs (Debian Stretch + htpasswd). Please see https://github.com/HanXHX/ansible-nginx/issues/28"
+  when:
+    ansible_distribution_major_version >= 9 and
+    ansible_version.full | version_compare('2.3.2', 'lt') and
+    nginx_htpasswd | length > 0
+
 - name: APT | Update cache
   apt: >
     update_cache=yes