Dependency updates (#2)

* Updated dependencies to PHP >=7.1 and Symfony ^4.0
Updated starlit inter-package dependencies

* Updated Travis CI to run tests on PHP 7.1 and 7.2

* Fixed typo

Author: PaulPylkas

.travis.yml

@@ -1,8 +1,8 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
+  - 7.1
+  - 7.2
 
 install:
   - composer install --dev --no-interaction

composer.json

@@ -11,17 +11,17 @@
         }
     ],
     "require": {
-        "php": ">=5.6.0",
+        "php": ">=7.1.0",
         "psr/container": "^1.0",
         "starlit/utils": "~0.1",
-        "symfony/http-foundation": "^3.0",
-        "symfony/routing": "^3.0",
+        "symfony/http-foundation": "^4.0",
+        "symfony/routing": "^4.0",
         "filp/whoops": "^2.0",
         "monolog/monolog": "^1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7",
-        "starlit/paginator": "~0.1"
+        "starlit/paginator": "~0.2"
     },
     "autoload": {
         "psr-4": {"Starlit\\App\\": "src"}