Add PHP 7.4 support (#464)

* Add PHP 7.4 to build matrix

* DB fix

* YAML parser fix in test data

* Show versions

* Package updates

* Track used ICAOs

* 7.4 METAR parsing fix

* METAR parser fix

* Formatting

* Add meters to response units

* Call instance for unit conversion

* Return value

* Catch exception for unknown quantity

* Comment fix

* Formatting

* METAR parsing fixes on PHP 7.4

* Package updates

* More random airport ID

* More random airport ID

* Properly disable toolbar

* Semver written out to version file

* Use dev as default identifier

composer.json

@@ -57,7 +57,7 @@
         "bpocallaghan/generators": "5.0.1",
         "codedungeon/phpunit-result-printer": "^0.13.0",
         "filp/whoops": "~2.0",
-        "fzaninotto/faker": "~1.8.0",
+        "fzaninotto/faker": "~1.9.0",
         "friendsofphp/php-cs-fixer": "^2.15",
         "mockery/mockery": "0.9.*",
         "nunomaduro/collision": "^3.0",