Use four spaces in frontmatter blocks

source/_talks/goodbye-drush-make-hello-composer.md

@@ -3,25 +3,25 @@ title: Goodbye Drush Make. Hello Composer!
 description: How to use Composer to manage your Drupal applications.
 tags: ["meetup", "drupal", "composer"]
 speakerdeck:
-  id: 1c1e0e129ab34816bd4c4edb5f6642c2
-  ratio: "1.37081659973226"
-  url: https://speakerdeck.com/opdavies/goodbye-drush-make-hello-composer
+    id: 1c1e0e129ab34816bd4c4edb5f6642c2
+    ratio: "1.37081659973226"
+    url: https://speakerdeck.com/opdavies/goodbye-drush-make-hello-composer
 video:
-  type: youtube
-  id: ZL2FtRTX9Y8
+    type: youtube
+    id: ZL2FtRTX9Y8
 events:
-  -
-    name: PHP UK Conference 2018
-    location: London, UK
-    date: 2018-02-16
-    time: "14:40 - 15:40"
-    url: https://www.phpconference.co.uk
-    joindin: https://joind.in/talk/650ab
-  -
-    name: Drupal Bristol
-    location: Bristol, UK
-    url: https://www.drupalbristol.org.uk
-    date: 2016-11-17
+    -
+        name: PHP UK Conference 2018
+        location: London, UK
+        date: 2018-02-16
+        time: "14:40 - 15:40"
+        url: https://www.phpconference.co.uk
+        joindin: https://joind.in/talk/650ab
+    -
+        name: Drupal Bristol
+        location: Bristol, UK
+        url: https://www.drupalbristol.org.uk
+        date: 2016-11-17
 ---
 
 One of the main outcomes of Drupal 8 was “getting off the island” with third-party code included in core and adopting modern best practices from the wider PHP ecosystem - including [Composer][1], PHP’s dependency manager.