Bump Nixpkgs

Author: aspiwack

nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "f7c538837892dd2eb83567c9f380a11efb59b53f",
-        "sha256": "0xl33k24vfc29cg9lnp95kvcq69qbq5fzb7jk9ig4lgrhaarh651",
+        "rev": "dd678782cae74508d6b4824580d2b0935308011e",
+        "sha256": "0dk8dhh9vla2s409anmrfkva6h3r32xmz3cm8ha09wyk8iyf1f87",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/f7c538837892dd2eb83567c9f380a11efb59b53f.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/dd678782cae74508d6b4824580d2b0935308011e.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
@@ -17,10 +17,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "574d1eac1c200690e27b8eb4e24887f8df7ac27c",
-        "sha256": "0s6h7r9jin9sd8l85hdjwl3jsvzkddn3blggy78w4f21qa3chymz",
+        "rev": "0c501072d51fca9fc0f9fd123e106ad2f89c6b09",
+        "sha256": "0xmhs479g1gzqv320zlmx44wzqlnb741kp6zwj1m3nzzdv94v472",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/574d1eac1c200690e27b8eb4e24887f8df7ac27c.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/0c501072d51fca9fc0f9fd123e106ad2f89c6b09.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }