Update league/flysystem (#19)

composer.lock

@@ -1,7 +1,7 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
     "content-hash": "79d2941e9db0718ad1f2766ff912f324",
@@ -176,16 +176,16 @@
         },
         {
             "name": "league/flysystem",
-            "version": "1.0.49",
+            "version": "1.0.50",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/flysystem.git",
-                "reference": "a63cc83d8a931b271be45148fa39ba7156782ffd"
+                "reference": "dab4e7624efa543a943be978008f439c333f2249"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/a63cc83d8a931b271be45148fa39ba7156782ffd",
-                "reference": "a63cc83d8a931b271be45148fa39ba7156782ffd",
+                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/dab4e7624efa543a943be978008f439c333f2249",
+                "reference": "dab4e7624efa543a943be978008f439c333f2249",
                 "shasum": ""
             },
             "require": {
@@ -256,7 +256,7 @@
                 "sftp",
                 "storage"
             ],
-            "time": "2018-11-23T23:41:29+00:00"
+            "time": "2019-02-01T08:50:36+00:00"
         },
         {
             "name": "monolog/monolog",