Update from Forestry.io - Updated Forestry configuration

.forestry/front_matter/templates/blog-post.yml

+---
+label: Blog post
+hide_body: false
+fields:
+- type: text
+  name: title
+  label: title
+- type: text
+  name: author
+  label: author
+- type: text
+  name: type
+  label: type
+- type: datetime
+  name: date
+  label: date
+- type: text
+  name: url
+  label: url
+- type: list
+  name: categories
+  label: categories
+- type: list
+  name: tags
+  label: tags