emacsPackages.hamlet-mode: fix build

This package fails to build (and as far as I can tell always has) due
to the maintainer script being unable to parse the maintainer email.

adisbladis made a PR to fix this back in January, but it hasn't been
merged, so this commit just pulls that patch in in order to fix the build

pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix

@@ -507,6 +507,16 @@ let
           packageRequires = with self; [ evil highlight ];
         });
 
+        hamlet-mode = super.hamlet-mode.overrideAttrs (attrs: {
+          patches = [
+            # Fix build; maintainer email fails to parse
+            (pkgs.fetchpatch {
+              url = "https://github.com/lightquake/hamlet-mode/commit/253495d1330d6ec88d97fac136c78f57c650aae0.patch";
+              sha256 = "dSxS5yuXzCW96CUyvJWwjkhf1FMGBfiKKoBxeDVdz9Y=";
+            })
+          ];
+        });
+
         helm-rtags = fix-rtags super.helm-rtags;
 
         # tries to write to $HOME