Reduce minimum laravel version.

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>

.travis.yml

@@ -12,17 +12,8 @@ env:
     - setup=basic
     - coverage=no
   matrix:
-    - laravel=5.5.*
-    - laravel=5.6.*
-    - laravel=5.7.*
     - laravel=5.8.*
-    - setup=lowest laravel=5.5.*
-    - setup=lowest laravel=5.6.*
-    - setup=lowest laravel=5.7.*
     - setup=lowest laravel=5.8.*
-    - setup=stable laravel=5.5.*
-    - setup=stable laravel=5.6.*
-    - setup=stable laravel=5.7.*
     - setup=stable laravel=5.8.*
 
 before_install:
@@ -45,7 +36,7 @@ after_script:
 matrix:
   include:
     - php: 7.1
-      env: setup=coveralls coverage=yes laravel=5.5.*
+      env: setup=coveralls coverage=yes laravel=5.8.*
   allow_failures:
-    - env: setup=coveralls coverage=yes laravel=5.5.*
+    - env: setup=coveralls coverage=yes laravel=5.8.*
   fast_finish: true

composer.json

@@ -16,8 +16,8 @@
     },
     "require": {
         "php": ">=7.1",
-        "illuminate/container": "^5.5",
-        "illuminate/support": "^5.5",
+        "illuminate/container": "^5.8",
+        "illuminate/support": "^5.8",
         "katsana/katsana-sdk-laravel": "^1.0",
         "socialiteproviders/manager": "^3.3"
     },