Fix wrong claim: additionalProperties was introduced in Draft 0 (#294)

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

content/2019-09/applicator/additionalProperties.markdown

@@ -12,7 +12,7 @@ tests:
 default:
   value: "{}"
 index: -998
-introduced_in: draft1
+introduced_in: draft0
 annotation:
    description: The set of instance property names validated by this keyword's subschema
    kind: [ "array" ]

content/2020-12/applicator/additionalProperties.markdown

@@ -12,7 +12,7 @@ tests:
 default:
   value: "{}"
 index: -998
-introduced_in: draft1
+introduced_in: draft0
 annotation:
    description: The set of instance property names validated by this keyword's subschema
    kind: [ "array" ]

content/draft3/core/additionalProperties.markdown

@@ -11,7 +11,7 @@ tests:
   - draft3/additionalProperties.json
 default:
   value: "{}"
-introduced_in: draft1
+introduced_in: draft0
 index: -99987
 interdependencies:
   - vocabulary: core

content/draft4/validation/additionalProperties.markdown

@@ -11,7 +11,7 @@ tests:
   - draft4/additionalProperties.json
 default:
   value: "{}"
-introduced_in: draft1
+introduced_in: draft0
 index: -4
 interdependencies:
   - vocabulary: validation

content/draft6/validation/additionalProperties.markdown

@@ -11,7 +11,7 @@ tests:
   - draft6/additionalProperties.json
 default:
   value: "{}"
-introduced_in: draft1
+introduced_in: draft0
 index: -4
 interdependencies:
   - vocabulary: validation

content/draft7/validation/additionalProperties.markdown

@@ -11,7 +11,7 @@ tests:
   - draft7/additionalProperties.json
 default:
   value: "{}"
-introduced_in: draft1
+introduced_in: draft0
 index: -4
 interdependencies:
   - vocabulary: validation

layouts/partials/dialect-badge.html

@@ -28,6 +28,9 @@
 {{ else if eq (.name) "draft1" }}
   <span class="badge text-bg-secondary"
     data-bs-toggle="tooltip" data-bs-title="This dialect has not been documented on this site (yet)">Draft 1</span>
+{{ else if eq (.name) "draft0" }}
+  <span class="badge text-bg-secondary"
+    data-bs-toggle="tooltip" data-bs-title="This dialect has not been documented on this site (yet)">Draft 0</span>
 {{ else }}
   {{ errorf "Unrecognized dialect: %q" .name }}
 {{ end }}