Fix deprection warning

Use include_tasks instead of include (requires Ansible 2.4)

tasks/main.yml

@@ -106,7 +106,8 @@
     state: touch
   changed_when: False
 
-- include: create_conda_env.yml
+- name: create conda environment(s)
+  include_tasks: create_conda_env.yml
   with_items: "{{ conda_env_files }}"
   loop_control:
     loop_var: env_file