Update league/flysystem (#6)

composer.lock

@@ -8,16 +8,16 @@
     "packages": [
         {
             "name": "league/flysystem",
-            "version": "1.0.45",
+            "version": "1.0.46",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/flysystem.git",
-                "reference": "a99f94e63b512d75f851b181afcdf0ee9ebef7e6"
+                "reference": "f3e0d925c18b92cf3ce84ea5cc58d62a1762a2b2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/a99f94e63b512d75f851b181afcdf0ee9ebef7e6",
-                "reference": "a99f94e63b512d75f851b181afcdf0ee9ebef7e6",
+                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/f3e0d925c18b92cf3ce84ea5cc58d62a1762a2b2",
+                "reference": "f3e0d925c18b92cf3ce84ea5cc58d62a1762a2b2",
                 "shasum": ""
             },
             "require": {
@@ -29,7 +29,7 @@
             "require-dev": {
                 "ext-fileinfo": "*",
                 "phpspec/phpspec": "^3.4",
-                "phpunit/phpunit": "^5.7"
+                "phpunit/phpunit": "^5.7.10"
             },
             "suggest": {
                 "ext-fileinfo": "Required for MimeType",
@@ -88,7 +88,7 @@
                 "sftp",
                 "storage"
             ],
-            "time": "2018-05-07T08:44:23+00:00"
+            "time": "2018-08-22T07:45:22+00:00"
         },
         {
             "name": "mikecao/flight",