Make dependencies stricter

By depending on elm/bytes and elm/file, the ranges for elm/json and
elm/core are stricter in practice. So this just tightens them up to
match.

Author: evancz

elm.json

@@ -10,9 +10,9 @@
     "elm-version": "0.19.0 <= v < 0.20.0",
     "dependencies": {
         "elm/bytes": "1.0.0 <= v < 2.0.0",
-        "elm/core": "1.0.0 <= v < 2.0.0",
+        "elm/core": "1.0.1 <= v < 2.0.0",
         "elm/file": "1.0.0 <= v < 2.0.0",
-        "elm/json": "1.0.0 <= v < 2.0.0"
+        "elm/json": "1.1.0 <= v < 2.0.0"
     },
     "test-dependencies": {}
 }