yadm: install from build directory instead of $src

Noticed while trying to use substituteInPlace from prePatch that my changes
weren't applying to the installed copy.

maintainers/maintainer-list.nix

@@ -87,6 +87,12 @@
     githubId = 178750;
     name = "Andreas Baldeau";
   };
+  abathur = {
+    email = "travis.a.everett+nixpkgs@gmail.com";
+    github = "abathur";
+    githubId = 2548365;
+    name = "Travis A. Everett";
+  };
   abbe = {
     email = "ashish.is@lostca.se";
     github = "wahjava";

pkgs/applications/version-management/yadm/default.nix

@@ -19,10 +19,10 @@ stdenv.mkDerivation {
 
   installPhase = ''
     runHook preInstall
-    install -Dt $out/bin $src/yadm
-    install -Dt $out/share/man/man1 $src/yadm.1
-    install -D $src/completion/yadm.zsh_completion $out/share/zsh/site-functions/_yadm
-    install -D $src/completion/yadm.bash_completion $out/share/bash-completion/completions/yadm.bash
+    install -Dt $out/bin yadm
+    install -Dt $out/share/man/man1 yadm.1
+    install -D completion/yadm.zsh_completion $out/share/zsh/site-functions/_yadm
+    install -D completion/yadm.bash_completion $out/share/bash-completion/completions/yadm.bash
     runHook postInstall
   '';
 
@@ -36,6 +36,7 @@ stdenv.mkDerivation {
       * Supplies a method of encrypting confidential data so it can safely be stored in your repository.
     '';
     license = stdenv.lib.licenses.gpl3;
+    maintainers = with stdenv.lib.maintainers; [ abathur ];
     platforms = stdenv.lib.platforms.unix;
   };
 }