update default nixpkgs to 19.03

README.md

@@ -83,7 +83,7 @@ initialized with niv and nixpkgs:
     "nixpkgs": {
         "url": "https://github.com/NixOS/nixpkgs-channels/archive/109a28ab954a0ad129f7621d468f829981b8b96c.tar.gz",
         "owner": "NixOS",
-        "branch": "nixos-18.09",
+        "branch": "nixos-19.03",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
         "repo": "nixpkgs-channels",
         "sha256": "12wnxla7ld4cgpdndaipdh3j4zdalifk287ihxhnmrzrghjahs3q",
@@ -120,7 +120,7 @@ import sources.nixpkgs                  # and use them again!
 #### Tracking a nixpkgs branch
 
 The `init` command sets the `nix/sources.json` file to track the latest commit
-present on nixpkgs 18.09 when the command was run. Run the following command to
+present on nixpkgs 19.03 when the command was run. Run the following command to
 update it:
 
 ``` shell
@@ -208,7 +208,7 @@ Available commands:
 Examples:
 
   niv add stedolan/jq
-  niv add NixOS/nixpkgs-channels -n nixpkgs -b nixos-18.09
+  niv add NixOS/nixpkgs-channels -n nixpkgs -b nixos-19.03
   niv add my-package -v alpha-0.1 -t http://example.com/archive/<version>.zip
 
 Usage: niv add [-n|--name NAME] PACKAGE ([-a|--attribute KEY=VAL] |

README.tpl.md

@@ -83,7 +83,7 @@ initialized with niv and nixpkgs:
     "nixpkgs": {
         "url": "https://github.com/NixOS/nixpkgs-channels/archive/109a28ab954a0ad129f7621d468f829981b8b96c.tar.gz",
         "owner": "NixOS",
-        "branch": "nixos-18.09",
+        "branch": "nixos-19.03",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
         "repo": "nixpkgs-channels",
         "sha256": "12wnxla7ld4cgpdndaipdh3j4zdalifk287ihxhnmrzrghjahs3q",
@@ -120,7 +120,7 @@ import sources.nixpkgs                  # and use them again!
 #### Tracking a nixpkgs branch
 
 The `init` command sets the `nix/sources.json` file to track the latest commit
-present on nixpkgs 18.09 when the command was run. Run the following command to
+present on nixpkgs 19.03 when the command was run. Run the following command to
 update it:
 
 ``` shell

src/Niv/Cli.hs

@@ -182,14 +182,14 @@ cmdInit = do
       , ( pathNixSourcesJson
         , \path -> do
             createFile path initNixSourcesJsonContent
-            -- Imports @niv@ and @nixpkgs@ (18.09)
+            -- Imports @niv@ and @nixpkgs@ (19.03)
             putStrLn "Importing 'niv' ..."
             cmdAdd Nothing (PackageName "nmattia/niv", PackageSpec HMS.empty)
             putStrLn "Importing 'nixpkgs' ..."
             cmdAdd
               (Just (PackageName "nixpkgs"))
               ( PackageName "NixOS/nixpkgs-channels"
-              , PackageSpec (HMS.singleton "branch" "nixos-18.09"))
+              , PackageSpec (HMS.singleton "branch" "nixos-19.03"))
         , \path _content -> dontCreateFile path)
       ] $ \(path, onCreate, onUpdate) -> do
           exists <- Dir.doesFileExist path
@@ -227,7 +227,7 @@ parseCmdAdd =
           "Examples:" Opts.<$$>
           "" Opts.<$$>
           "  niv add stedolan/jq" Opts.<$$>
-          "  niv add NixOS/nixpkgs-channels -n nixpkgs -b nixos-18.09" Opts.<$$>
+          "  niv add NixOS/nixpkgs-channels -n nixpkgs -b nixos-19.03" Opts.<$$>
           "  niv add my-package -v alpha-0.1 -t http://example.com/archive/<version>.zip"
       ]
 

tests/expected/niv-init.json

@@ -12,7 +12,7 @@
         "url_template": "http://localhost:3333/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-18.09",
+        "branch": "nixos-19.03",
         "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
         "homepage": null,
         "owner": "NixOS",