Updates dependency constraints.

Author: sikhlana

.travis.yml

@@ -1,14 +1,12 @@
 language: php
 
 php:
-  - '5.5'
-  - '5.6'
-  - '7.0'
   - '7.1'
   - '7.2'
+  - '7.3'
+  - '7.4'
 
 env:
-  - MYSQL_VERSION=5.7
   - MYSQL_VERSION=8.0
 
 dist: trusty

composer.json

@@ -15,10 +15,10 @@
         }
     ],
     "require": {
-        "php": ">=5.5",
+        "php": ">=7.1.3",
         "ext-pdo": "*",
         "ext-json": "*",
-        "illuminate/database": "^5.2|^6.0",
+        "illuminate/database": "^5.6|^6.0",
         "geo-io/wkb-parser": "^1.0",
         "jmikola/geojson": "^1.0"
     },