fix

Author: ocavue

index.d.ts

@@ -1,5 +1,5 @@
 // Minimum TypeScript Version: 3.0
-import {Buffer, SyntaxExtension, Token} from 'micromark/dist/shared-types'
+import {Buffer, BufferEncoding, SyntaxExtension, Token} from 'micromark/dist/shared-types'
 import {Root} from 'mdast'
 import {Type} from 'micromark/dist/constant/types'