Support till php 7.3

- Update packages
- Update Travis CI
- Commit composer.lock

.gitignore

@@ -1,3 +1,2 @@
 build
-composer.lock
-vendor
+vendor

.travis.yml

@@ -1,8 +1,9 @@
 language: php
 
 php:
-  - 7.0
   - 7.1
+  - 7.2
+  - 7.3
 
 branches:
   except:
@@ -15,4 +16,4 @@ script:
   - vendor/bin/phpunit --verbose --coverage-text --coverage-clover=coverage.xml
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)

composer.json

@@ -34,15 +34,18 @@
       "Codedge\\Updater\\Tests\\": "tests/"
     }
   },
+  "config": {
+    "sort-packages": true
+  },
   "require": {
-    "php": ">=7.0",
+    "php": ">=7.1",
     "ext-zip": "*",
     "illuminate/support": "5.*",
     "guzzlehttp/guzzle": "6.*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^5.5",
-    "orchestra/testbench": "3.2.*",
+    "phpunit/phpunit": "^7",
+    "orchestra/testbench": "3.7.*",
     "mockery/mockery": "^0.9.5"
   }
 }