Releasing "Optional" Json Fields in 2.x

[andylibrian]

Can we release "optional" json fields in 2.x version? Maybe 2.3?
Apparently, it's not yet using php7 syntax.

Ref:

• Optional JSON fields #93
• Allow to mark JSON properties & XML nodes as optional #102
• 8cfa24b

[norberttech]

Here you go: #107

[andylibrian]

Awesome, thanks. Looking forward to merging and releasing.

[norberttech]

https://github.com/coduo/php-matcher/releases/tag/2.3.0