Merge branch 'modify_rfc3339_date_format'

TakayukiHoshi1984 · TakayukiHoshi1984 · commit 817b9ab95acd · 2017-12-15T10:36:52.000+09:00
diff --git a/api/availability.json b/api/availability.json
@@ -43,8 +43,6 @@
                 },
                 {
                     "type": "object",
-                    "required": [
-                    ],
                     "properties": {
                         "name": {
                             "type": "string",
