Add Table of Contents

Author: oxinabox

_posts/2021-03-14-Julia-1.6-what-has-changed-since-1.0.md _posts/2021-02-13-Julia-1.6-what-has-changed-since-1.0.md

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 Julia 1.6 is a huge release and it is coming out relatively soon.
 RC-1 was [released recently](https://discourse.julialang.org/t/julia-v1-6-0-rc1-is-now-available/54775).
 I suspect we have at least a few more weeks before the final release.