Fix plantuml service error

Author: dy93

index.js

@@ -62,13 +62,13 @@ module.exports = {
  'page:before': async function(page) {
  let content = page.content;
  const output = this.output;
- 
+
  const umls = [];
  const re = new RegExp(options.blockRegex, 'img');
 
  while (match = re.exec(content)) {
  const rawBlock = match[0];
- const umlBlock = match[1];
+ const umlBlock = match[1].trim();
  const md5 = crypto.createHash('md5').update(umlBlock).digest('hex');
  const svgPath = path.join(options.umlPath, `${md5}.svg`);
  umls.push({rawBlock, umlBlock,svgPath});