Improve auto-assignment of ansible language to files (#1330)

* recognise main.yml files inside roles as ansible files

* recognise ansible files based on modelines

package.json

@@ -701,12 +701,15 @@
           "**/playbooks/*.yml",
           "**/playbooks/*.yaml",
           "**/*playbook*.yml",
-          "**/*playbook*.yaml"
+          "**/*playbook*.yaml",
+          "**/roles/**/main.yml",
+          "**/roles/**/main.yaml"
         ],
         "filenames": [
           "site.yml",
           "site.yaml"
         ],
+        "firstLine": "# code: language=ansible",
         "configuration": "./ansible-language-configuration.json"
       },
       {