added canonicalUrl support

scripts/compose.js

@@ -40,6 +40,7 @@ const genFrontMatter = (answers) => {
   summary: ${answers.summary ? answers.summary : ' '}
   images: []
   layout: ${answers.layout}
+  canonical: ${answers.canonical}
   `
 
   if (answers.authors.length > 0) {
@@ -92,6 +93,11 @@ inquirer
       type: 'list',
       choices: getLayouts,
     },
+    {
+      name: 'canonical',
+      message: 'Enter canonical url:',
+      type: 'input',
+    },
   ])
   .then((answers) => {
     // Remove special characters and replace space with -