Updated README

README.md

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-SymfonyDay 2020 code
+![sfday2020banner](https://2020.sfday.it/img/confs/sfday/header_sfday.png)
+<hr>
+
+## Stop mocking everything - Samuele Lilli
+
+[Schedule](https://grusp.us5.list-manage.com/track/click?u=29d918424cd5375f4c0c54c00&id=7cca83980b&e=ccd6902ba1)
+
+[Talk](https://2020.sfday.it/talks.html#samuele-lilli)
+
+[Rate this talk on joind.in](https://grusp.us5.list-manage.com/track/click?u=29d918424cd5375f4c0c54c00&id=07e4db6ad4&e=ccd6902ba1)
+<hr>
+
+## Useful informations
+
+Master branch has only the `Invoice` trivial class, so if you want to navigate through all the examples, please check out
+the [tags](https://github.com/DonCallisto/sfday2020/releases).
+
+If you would like to run all the tests, use the following commands
+
+```
+// From root of the project
+bin/phpspec run // To run PHPSpec test suite
+bin/phpunit // To run all PHPUnit test suites
+```
+
+Martin Fowler's blog post about what a unit is: https://martinfowler.com/bliki/UnitTest.html
+<hr>
+
+# 🚀 WE'RE HIRING 🚀
+![MadisoftLogo](https://labs.madisoft.it/wp-content/uploads/2020/09/logo.png)
+
+Take a look to [open positions](https://labs.madisoft.it/entra-nel-team/) and checkout our [tech blog](https://labs.madisoft.it/blog/)!
+
+We're [sponsoring this event](https://2020.sfday.it/sponsor.html)