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diff --git a/node_modules/markdown-it/lib/rules_block/lheading.js b/node_modules/markdown-it/lib/rules_block/lheading.js
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+++ b/node_modules/markdown-it/lib/rules_block/lheading.js
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+// lheading (---, ===)
+
+'use strict';
+
+
+module.exports = function lheading(state, startLine, endLine/*, silent*/) {
+  var content, terminate, i, l, token, pos, max, level, marker,
+      nextLine = startLine + 1, oldParentType,
+      terminatorRules = state.md.block.ruler.getRules('paragraph');
+
+  // if it's indented more than 3 spaces, it should be a code block
+  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }
+
+  oldParentType = state.parentType;
+  state.parentType = 'paragraph'; // use paragraph to match terminatorRules
+
+  // jump line-by-line until empty one or EOF
+  for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
+    // this would be a code block normally, but after paragraph
+    // it's considered a lazy continuation regardless of what's there
+    if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }
+
+    //
+    // Check for underline in setext header
+    //
+    if (state.sCount[nextLine] >= state.blkIndent) {
+      pos = state.bMarks[nextLine] + state.tShift[nextLine];
+      max = state.eMarks[nextLine];
+
+      if (pos < max) {
+        marker = state.src.charCodeAt(pos);
+
+        if (marker === 0x2D/* - */ || marker === 0x3D/* = */) {
+          pos = state.skipChars(pos, marker);
+          pos = state.skipSpaces(pos);
+
+          if (pos >= max) {
+            level = (marker === 0x3D/* = */ ? 1 : 2);
+            break;
+          }
+        }
+      }
+    }
+
+    // quirk for blockquotes, this line should already be checked by that rule
+    if (state.sCount[nextLine] < 0) { continue; }
+
+    // Some tags can terminate paragraph without empty line.
+    terminate = false;
+    for (i = 0, l = terminatorRules.length; i < l; i++) {
+      if (terminatorRules[i](state, nextLine, endLine, true)) {
+        terminate = true;
+        break;
+      }
+    }
+    if (terminate) { break; }
+  }
+
+  if (!level) {
+    // Didn't find valid underline
+    return false;
+  }
+
+  content = state.getLines(startLine, nextLine, state.blkIndent, false).trim();
+
+  state.line = nextLine + 1;
+
+  token          = state.push('heading_open', 'h' + String(level), 1);
+  token.markup   = String.fromCharCode(marker);
+  token.map      = [ startLine, state.line ];
+
+  token          = state.push('inline', '', 0);
+  token.content  = content;
+  token.map      = [ startLine, state.line - 1 ];
+  token.children = [];
+
+  token          = state.push('heading_close', 'h' + String(level), -1);
+  token.markup   = String.fromCharCode(marker);
+
+  state.parentType = oldParentType;
+
+  return true;
+};