Fix the type of signatures in metadata (#116)

See NixOS/hackage-db#17

cabal.project

@@ -6,9 +6,9 @@ allow-newer: hackage-db:Cabal, hpack:Cabal
 
 source-repository-package
     type: git
-    location: https://github.com/hamishmack/hackage-db.git
-    tag: 173783814c9e2d7b80d5d4b5a628334361a0b34a
-    --sha256: sha256-T6cKhYvCaWua6S87PYo6LrOvhg2JGjdjm2XLan9300Y=
+    location: https://github.com/michaelpj/hackage-db.git
+    tag: f3b9240212b036391871e4ea09891e91efcea7a1
+    --sha256: sha256-n0ATmkwtR68E2FuZK3QIQgZirVmWbd21vIQmzhGKsRw=
 
 -- hnix requires hnix-store-core < 0.2, however hnix-store-core-0.1 breaks
 -- plan construction.

nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": "https://input-output-hk.github.io/haskell.nix",
         "owner": "input-output-hk",
         "repo": "haskell.nix",
-        "rev": "355cd3701db115b494b13dbb613175345df059ed",
-        "sha256": "0lvwnva4g3wjmqpzj9cny7v1wrya4kq5617zxz61fhjhf8z79wk6",
+        "rev": "aaae688f4700c788243e5c5508c5e17e0f8f50ab",
+        "sha256": "0b7ih529mfq72sfpmzix8r6zqgvqwcz0j9va9z9qm5gr3hb2y698",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/haskell.nix/archive/355cd3701db115b494b13dbb613175345df059ed.tar.gz",
+        "url": "https://github.com/input-output-hk/haskell.nix/archive/aaae688f4700c788243e5c5508c5e17e0f8f50ab.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {
@@ -22,17 +22,5 @@
         "type": "tarball",
         "url": "https://github.com/nmattia/niv/archive/f73bf8d584148677b01859677a63191c31911eae.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs": {
-        "branch": "nixos-19.09",
-        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
-        "homepage": "https://github.com/NixOS/nixpkgs",
-        "owner": "NixOS",
-        "repo": "nixpkgs-channels",
-        "rev": "289466dd6a11c65a7de4a954d6ebf66c1ad07652",
-        "sha256": "0r5ja052s86fr54fm1zlhld3fwawz2w1d1gd6vbvpjrpjfyajibn",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c65a7de4a954d6ebf66c1ad07652.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }