Build the logo on Travis before running osx-bundle

.travis.yml

@@ -102,6 +102,10 @@ install: |
             brew update;
             brew upgrade python;
             brew install harfbuzz --without-glib --without-gobject-introspection --without-graphite2 --without-icu4c --without-freetype;
+            brew install imagemagick
+            brew install optipng
+            brew install librsvg
+            logo/make.py
         else
             mkdir -p $SW;
             curl https://download.calibre-ebook.com/travis/kitty/osx.tar.xz | tar xJ -C $SW;