fixup! 🚧 Use tsv-utils for --output-metadata

Author: victorlin

augur/filter/io.py

@@ -104,6 +104,8 @@ def get_cat(file):
         return which("gzcat")
     if file.endswith(".xz"):
         return which("xzcat")
+    if file.endswith(".zst"):
+        return which("zstdcat")
     else:
         return which("cat")