dhall: upgrade minimum compatible Dhall version to at least 1.29.0

This commit also upgrades the nix channel used in the CI to be able to
test with Dhall v1.34.0

3 files changed, 5 insertions, 6 deletions

diff --git a/.travis.yml b/.travis.yml
index e42204f..31c3ecf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@
 language: nix
 nix: 2.3.4
 env:
-  - CUSTOM_NIX_PATH=nixpkgs=channel:nixos-20.03
+  - CUSTOM_NIX_PATH=nixpkgs=channel:nixos-20.09
 
 # Travis nix integration will install nix AFTER the environment variables are set
 # and the nix installer will overide NIX_PATH variable thus we need to re-export it
diff --git a/README.md b/README.md
index 499dced..c7d7415 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Requirements
 
 This role requires [`clever-tools`](https://github.com/CleverCloud/clever-tools) CLI version `2.6.1` or higher.
 
-If you want to configure this role with [Dhall](https://dhall-lang.org/) instead of YAML, the role publishes dhall bindings defined in the `dhall/package.dhall` file. These bindings will need Dhall version `1.26.0` or higher.
+If you want to configure this role with [Dhall](https://dhall-lang.org/) instead of YAML, the role publishes dhall bindings defined in the `dhall/package.dhall` file. These bindings will need Dhall version `1.29.0` or higher.
 
 Role Variables
 --------------
diff --git a/default.nix b/default.nix
index 15ee01e..d68a922 100644
--- a/default.nix
+++ b/default.nix
@@ -3,9 +3,8 @@
 with pkgs;
 {
   inherit shellcheck
-          ansible_2_8;
-  inherit (python37Packages)
+          ansible_2_8
+          dhall;
+  inherit (python3Packages)
           ansible-lint;
-  inherit (haskellPackages)
-          dhall_1_27_0;
 }