add plugin before linkify

plugin markdown-it-implicit-figures is added before linkify,
so to assure that attrs plugin is added before implicit-figures
.use() attrs first, then implicit-figures:

md.use(attrs).use(implicitFigures)

ref: arve0/markdown-it-implicit-figures#18

index.js

@@ -139,7 +139,7 @@ module.exports = function attributes(md) {
 
     }
   }
-  md.core.ruler.before('replacements', 'curly_attributes', curlyAttrs);
+  md.core.ruler.before('linkify', 'curly_attributes', curlyAttrs);
 };
 
 /**