updated some broken links

README.md

@@ -1,6 +1,7 @@
 - [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1404735.svg)](https://doi.org/10.5281/zenodo.1404735)
 - [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fcitation-file-format%2Fcff-initializer-javascript.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fcitation-file-format%2Fcff-initializer-javascript?ref=badge_shield)
 - [![Build Status](https://travis-ci.org/citation-file-format/cff-initializer-javascript.svg?branch=master)](https://travis-ci.org/citation-file-format/cff-initializer-javascript)
+- [![Markdown links](https://github.com/citation-file-format/cff-initializer-javascript/workflows/Check%20Markdown%20links/badge.svg)](https://github.com/citation-file-format/cff-initializer-javascript/actions?query=workflow%3A%22Check+Markdown+links%22)
 
 # Web form to initialize CITATION.cff files.
 
@@ -10,7 +11,7 @@
 
 - Check out the **live version** [here](https://citation-file-format.github.io/cff-initializer-javascript/).
 - For the rationale behind CITATION.cff files, read [the blog](https://www.software.ac.uk/blog/2017-12-12-standard-format-citation-files).
-- For the Citation File Format specification, go [here](https://citation-file-format.github.io/versions).
+- For the Citation File Format specification, go [here](https://github.com/citation-file-format/citation-file-format) (latest) or [here](https://doi.org/10.5281/zenodo.1003149) (stable).
 - For the Citation File Format home page, go [here](https://citation-file-format.github.io).
 
 # Documentation for developers