update php8 course #2

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richnieh merged 10 commits intorichnieh:masterfrom

Sep 24, 2020

Commits on Sep 18, 2020

2020-09-18 DB: updated README
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2020-09-18 DB: Updated README
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2020-09-18 DB: Added Ext Gotchas Lab
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Commits on Sep 22, 2020

2020-09-22 DB: Working on Cool Stuff unit'
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2020-09-22 DB: Added example for nullsafe operator
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2020-09-22 DB: Added example for nullsafe operator
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2020-09-22 DB: Finished Cool Stuff section except for lab
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Commits on Sep 23, 2020

2020-09-23 DB: Finished Cool Stuff + Lab
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Commits on Sep 24, 2020

2020-09-24 DB: Finished 'Cool Stuff in Ext' unit
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2020-09-24 DB: Finished 'Cool Stuff in Ext' unit
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