fixes yaml syntax highlighting in README

README.md

@@ -39,8 +39,8 @@ Docker Compose installation options.
 
 Many users of this role wish to also use Ansible to then _build_ Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the `docker` Python library using the `geerlingguy.pip` role:
 
-    ```yaml
-    - hosts: all
+```yaml
+- hosts: all
 
   vars:
     pip_install_packages:
@@ -49,7 +49,7 @@ Many users of this role wish to also use Ansible to then _build_ Docker images a
   roles:
     - geerlingguy.pip
     - geerlingguy.docker
-    ```
+```
 
 ## Dependencies
 
@@ -57,11 +57,11 @@ None.
 
 ## Example Playbook
 
-    ```yaml
-    - hosts: all
+```yaml
+- hosts: all
   roles:
     - geerlingguy.docker
-    ```
+```
 
 ## License