move elm/file to indirect dependencies

elm.json

@@ -8,7 +8,6 @@
         "direct": {
             "elm/browser": "1.0.2",
             "elm/core": "1.0.5",
-            "elm/file": "1.0.5",
             "elm/html": "1.0.0",
             "elm/http": "2.0.0",
             "elm/json": "1.1.3",
@@ -19,6 +18,7 @@
         },
         "indirect": {
             "elm/bytes": "1.0.8",
+            "elm/file": "1.0.5",
             "elm/virtual-dom": "1.0.3"
         }
     },