Bump Laravel version in composer as well

composer.json

@@ -11,10 +11,10 @@
     "license" : "MIT",
     "require": {
         "php": ">=5.4.0",
-        "illuminate/support": "^5.0",
-        "illuminate/container": "^5.0",
-        "illuminate/database": "^5.0",
-        "illuminate/events": "^5.0"
+        "illuminate/support": "^5.1",
+        "illuminate/container": "^5.1",
+        "illuminate/database": "^5.1",
+        "illuminate/events": "^5.1"
     },
     "require-dev": {
         "orchestra/testbench": "~3.1.0",