Update companies.md

companies.md

@@ -83,13 +83,13 @@ permalink: /companies/
 * [Flatiron Health](https://www.flatiron.com/)
 * [Gemini Trust](https://gemini.com/)
 * [Jet.com](https://jet.com/)
+* [Justworks](https://www.justworks.com/)
 * [MongoDB](https://www.mongodb.com/)
 * [The New York Times](https://www.nytimes.com/)
 * [Peloton](https://www.onepeloton.com)
 * [Planned Parenthood Federation of America](https://plannedparenthood.org)
 * [Spotify](https://www.spotify.com/)
 * [Squarespace](https://www.squarespace.com/)
-* [Tumblr](https://www.tumblr.com/)
 * [Two Sigma](https://twosigma.com/)
 * Every Bank ([Goldman](http://www.goldmansachs.com/), [JPM](https://www.jpmorgan.com/), [NY Fed](https://www.newyorkfed.org/), etc)
 
@@ -106,6 +106,7 @@ permalink: /companies/
 * [MWR InfoSecurity](https://www.mwrinfosecurity.com/)
 * [NCC Group](https://www.nccgroup.trust/us/)
 * [Nisos](https://www.nisos.com/)
+* [Notion](https://www.notion.so/)
 * [Signal Sciences](https://www.signalsciences.com)
 * [Square](https://squareup.com/)
 * [Yahoo!](https://www.yahoo.com/)