Normalize paths to fix false positives on Windows [HC-1504] (#339)

Normalize paths to fix false positives on Windows

Author: seaxwi

_linter/markdownlint/rules/hc002.js

@@ -9,6 +9,10 @@ var glob = require("glob");
 const path = require('path');
 // TODO: https://stackoverflow.com/a/2186565
 const filePaths = glob.sync('content/**/*');
+let normPaths = [];
+for (var filePath of filePaths) {
+  normPaths.push(path.normalize(filePath));
+}
 
 module.exports = {
   "names": [ "HC002", "no-missing-images" ],
@@ -19,7 +23,7 @@ module.exports = {
       var dir = path.dirname(params.name);
       var imgPath = path.join(dir, token.attrs[0][1]);
 
-      if (!filePaths.includes(imgPath)) {
+      if (!normPaths.includes(path.normalize(imgPath))) {
         addError(onError, token.lineNumber, null, imgPath);
       }
     });