cleaned up flake file

flake.nix

@@ -1,6 +1,5 @@
 {
   inputs = {
-    
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
     libgourou-utils.url = "github:BentonEdmondson/libgourou-utils";
@@ -19,11 +18,14 @@
       pname = "knock";
       version = "0.1.0-alpha";
       src = self;
+
       nativeBuildInputs = [ nixpkgs.makeWrapper ];
+
       buildInputs = [
         (nixpkgs.python3.withPackages(python3Packages: [ python3Packages.python_magic ]))
         libgourou-utils inept-epub
       ];
+
       installPhase = ''
         mkdir -p $out/bin
         chmod +x knock
@@ -43,6 +45,5 @@
         platforms = [ "x86_64-linux" ];
       };
     };
-
   };
 }