Add polygon rooms that can actually kind of be used

It's still kind of strange to use the polygon tool, but at least it
seems stable enough so I'm confident enough (and sick enough of it) to
release it into the wild.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 5094fa3..b59cc6a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,3 +15,4 @@ svgtypes = "*"
 xmltree = "*"
 pretty_env_logger = "*"
 log = "*"
+thiserror = "*"