Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: ensemble-chorus 0-unstable-2019-02-15 -> 15-02-2019 https://repology.org/project/ensemble-chorus/versions
attrpath: ensemble-chorus
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/by-name/en/ensemble-chorus/package.nix b/pkgs/by-name/en/ensemble-chorus/package.nix
index 87feeb3f144e..d3e4480a2660 100644
--- a/pkgs/by-name/en/ensemble-chorus/package.nix
+++ b/pkgs/by-name/en/ensemble-chorus/package.nix
@@ -16,13 +16,13 @@
 
 stdenv.mkDerivation {
   pname = "ensemble-chorus";
-  version = "0-unstable-2019-02-15";
+  version = "15-02-2019";
 
   src = fetchFromGitHub {
     owner = "jpcima";
     repo = "ensemble-chorus";
     rev = "59baeb86b8851f521bc8162e22e3f15061662cc3";
-    sha256 = "0c1y10vyhrihcjvxqpqf6b52yk5yhwh813cfp6nla5ax2w88dbhr";
+    sha256 = "sha256-Ga6GEBddFUWtuY6NgCCHvkwvyjIOX9y3ZDBm6DcIPjA=";
     fetchSubmodules = true;
   };
 

rev equal; no update necessary