Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/dragonmantank/cron-expression/src/Cron/MonthField.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Cron;
+
+use DateTime;
+
+/**
+ * Month field.  Allows: * , / -
+ */
+class MonthField extends AbstractField
+{
+    protected $rangeStart = 1;
+    protected $rangeEnd = 12;
+    protected $literals = [1 => 'JAN', 2 => 'FEB', 3 => 'MAR', 4 => 'APR', 5 => 'MAY', 6 => 'JUN', 7 => 'JUL',
+        8 => 'AUG', 9 => 'SEP', 10 => 'OCT', 11 => 'NOV', 12 => 'DEC'];
+
+    public function isSatisfiedBy(DateTime $date, $value)
+    {
+        $value = $this->convertLiterals($value);
+
+        return $this->isSatisfied($date->format('m'), $value);
+    }
+
+    public function increment(DateTime $date, $invert = false)
+    {
+        if ($invert) {
+            $date->modify('last day of previous month');
+            $date->setTime(23, 59);
+        } else {
+            $date->modify('first day of next month');
+            $date->setTime(0, 0);
+        }
+
+        return $this;
+    }
+
+
+}