Fix linter error

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

public/js/lib/editor/markdown-lint/index.js

@@ -1,11 +1,13 @@
 /* global CodeMirror */
-window.markdownit = require('markdown-it')
-require('script-loader!markdownlint')
 
 // load CM lint plugin explicitly
 import '@hackmd/codemirror/addon/lint/lint'
 import './lint.css'
 
+window.markdownit = require('markdown-it')
+// eslint-disable-next-line
+require('script-loader!markdownlint');
+
 (function (mod) {
   mod(CodeMirror)
 })(function (CodeMirror) {