Merge branch 'phpver' into 'master'

Add PHP 8.0.

Closes #11

See merge request documentation/docs/installation!33

docs/general/requirements.md

@@ -67,7 +67,8 @@ It is also important to ensure that the same PHP extensions/modules are loaded o
 
 | | CiviCRM 5.33 ESR | CiviCRM 5.x.x stable |
 | ---- | ---- | ---- |
-| PHP 7.4 | **incompatible** | compatible and **recommended** from CiviCRM 5.37 onwards. There are still a couple of issues with regards to PHP7.4 being tracked in this [lab issue](https://lab.civicrm.org/dev/core/-/issues/1496) |
+| PHP 8.0 | **incompatible** | compatible from CiviCRM 5.39 however not **recommended** yet until the extension ecosystem catches up. |
+| PHP 7.4 | **incompatible** | compatible and **recommended** from CiviCRM 5.37 onwards. |
 | PHP 7.3 | compatible and **recommended** | compatible and **recommended** |
 | PHP 7.2 | compatible and **recommended** - but see note below about resaving the SMTP password | compatible and **recommended** but see note below about resaving the SMTP password |
 | PHP 7.1 | compatible but **not recommended** due to to [PHP end-of life](http://php.net/eol.php) in Dec 2019 | **incompatible** as of 5.35.0 |
@@ -85,7 +86,8 @@ It is also important to ensure that the same PHP extensions/modules are loaded o
     | 5.14 - 5.23              | 7.0                 | 7.2                     |
     | 5.24                     | 7.0                 | 7.3                     |
     | 5.25 - 5.34              | 7.1                 | 7.3                     |
-    | 5.35 - Current           | 7.2                 | 7.3                     |
+    | 5.35 - 5.36              | 7.2                 | 7.3                     |
+    | 5.37 - Current           | 7.2                 | 7.4                     |
 
 ### PHP Extensions