buildGoPackage: deps.json -> deps.nix in NIXON

https://github.com/NixOS/nixpkgs/pull/17254#issuecomment-245295541

* update docs to describe `deps.nix`
* include goDeps in nix-shell GOPATH
* NixOS 16.09 rel notes about replacing goPackages

pkgs/shells/elvish/default.nix

@@ -13,7 +13,7 @@ buildGoPackage rec {
     sha256 = "1xwhjbw0y6j5xy19hz39456l0v6vjg2icd7c1jx4h1cydk3yn39f";
   };
 
-  goDeps = ./deps.json;
+  goDeps = ./deps.nix;
 
   meta = with stdenv.lib; {
     description = "A Novel unix shell in go language";

pkgs/shells/elvish/deps.json

@@ -1,20 +0,0 @@
-[
-    {
-        "goPackagePath": "github.com/elves/getopt",
-        "fetch": {
-            "type": "git",
-            "url": "https://github.com/elves/getopt",
-            "rev": "f91a7bf920995832d55a1182f26657bc975b9c24",
-            "sha256": "0wz5dz0iq1b1c2w30mmcgll9xidsrnlvs2906jw9szy0h67310za"
-        }
-    },
-    {
-        "goPackagePath": "github.com/mattn/go-sqlite3",
-        "fetch": {
-            "type": "git",
-            "url": "https://github.com/mattn/go-sqlite3",
-            "rev": "b4142c444a8941d0d92b0b7103a24df9cd815e42",
-            "sha256": "0xq2y4am8dz9w9aaq24s1npg1sn8pf2gn4nki73ylz2fpjwq9vla"
-        }
-    }
-]

pkgs/shells/elvish/deps.nix

@@ -0,0 +1,20 @@
+[
+  {
+    goPackagePath = "github.com/elves/getopt";
+    fetch = {
+      type = "git";
+      url = "https://github.com/elves/getopt";
+      rev = "f91a7bf920995832d55a1182f26657bc975b9c24";
+      sha256 = "0wz5dz0iq1b1c2w30mmcgll9xidsrnlvs2906jw9szy0h67310za";
+    };
+  }
+  {
+    goPackagePath = "github.com/mattn/go-sqlite3";
+    fetch = {
+      type = "git";
+      url = "https://github.com/mattn/go-sqlite3";
+      rev = "b4142c444a8941d0d92b0b7103a24df9cd815e42";
+      sha256 = "0xq2y4am8dz9w9aaq24s1npg1sn8pf2gn4nki73ylz2fpjwq9vla";
+    };
+  }
+]