fix tight for all heading levels (#3)

Tight mode was failing for heading levels greater than 2

Author: gkatsev

lib/insert.js

@@ -58,18 +58,18 @@ function insert(node, parent, tight) {
     } else if (last && last.type === LIST) {
         node.depth--;
 
-        insert(node, last);
+        insert(node, last, tight);
     } else if (parent.type === LIST) {
         item = listItem();
 
-        insert(node, item);
+        insert(node, item, tight);
 
         children.push(item);
     } else {
         item = list();
         node.depth--;
 
-        insert(node, item);
+        insert(node, item, tight);
 
         children.push(item);
     }

test/fixtures/tight/input.md

@@ -6,4 +6,8 @@ Text.
 
 ## Something elsefi
 
+### Yet Another Thing
+
+### And another thing
+
 # Something iffi

test/fixtures/tight/output.json

@@ -70,6 +70,56 @@
                         ]
                       }
                     ]
+                  },
+                  {
+                    "type": "list",
+                    "ordered": false,
+                    "children": [
+                      {
+                        "type": "listItem",
+                        "loose": false,
+                        "children": [
+                          {
+                            "type": "paragraph",
+                            "children": [
+                              {
+                                "type": "link",
+                                "title": null,
+                                "url": "#yet-another-thing",
+                                "children": [
+                                  {
+                                    "type": "text",
+                                    "value": "Yet Another Thing"
+                                  }
+                                ]
+                              }
+                            ]
+                          }
+                        ]
+                      },
+                      {
+                        "type": "listItem",
+                        "loose": false,
+                        "children": [
+                          {
+                            "type": "paragraph",
+                            "children": [
+                              {
+                                "type": "link",
+                                "title": null,
+                                "url": "#and-another-thing",
+                                "children": [
+                                  {
+                                    "type": "text",
+                                    "value": "And another thing"
+                                  }
+                                ]
+                              }
+                            ]
+                          }
+                        ]
+                      }
+                    ]
                   }
                 ]
               }