markdown: Make exercise schema-compliant

exercises/markdown/canonical-data.json

@@ -1,60 +1,61 @@
 {
-  "#": [
+  "exercise": "markdown",
+  "version": "1.0.0",
+  "comments": [
     "Markdown is a shorthand for creating HTML from text strings."
   ],
-  "methods": {
-    "description": [
-      "Check the public API is correct."
-    ],
-    "cases": [{
-      "description": "must be able to parse a Markdown string",
-      "method": "parse",
-      "arity": 1
-    }]
-  },
   "cases": [
     {
-       "description": "parses normal text as a paragraph",
-       "input": "This will be a paragraph",
-       "expected": "<p>This will be a paragraph</p>"
+      "description": "parses normal text as a paragraph",
+      "property": "parse",
+      "input": "This will be a paragraph",
+      "expected": "<p>This will be a paragraph</p>"
     },
     {
       "description": "parsing italics",
+      "property": "parse",
       "input": "_This will be italic_",
       "expected": "<p><em>This will be italic</em></p>"
     },
     {
       "description": "parsing bold text",
+      "property": "parse",
       "input": "__This will be bold__",
       "expected": "<p><strong>This will be bold</strong></p>"
     },
     {
       "description": "mixed normal, italics and bold text",
+      "property": "parse",
       "input": "This will _be_ __mixed__",
       "expected": "<p>This will <em>be</em> <strong>mixed</strong></p>"
     },
     {
       "description": "with h1 header level",
+      "property": "parse",
       "input": "# This will be an h1",
       "expected": "<h1>This will be an h1</h1>"
     },
     {
       "description": "with h2 header level",
+      "property": "parse",
       "input": "## This will be an h2",
       "expected": "<h2>This will be an h2</h2>"
     },
     {
       "description": "with h6 header level",
+      "property": "parse",
       "input": "###### This will be an h6",
       "expected": "<h6>This will be an h6</h6>"
     },
     {
       "description": "unordered lists",
+      "property": "parse",
       "input": "* Item 1\n* Item 2",
       "expected": "<ul><li><p>Item 1</p></li><li><p>Item 2</p></li></ul>"
     },
     {
       "description": "With a little bit of everything",
+      "property": "parse",
       "input": "# Header!\n* __Bold Item__\n* _Italic Item_",
       "expected": "<h1>Header!</h1><ul><li><strong>Bold Item</strong></li><li><em>Italic Item</em></li></ul>"
     }