Escape command arguments on dry option

This allows the output to be passed to eval in a script (or something
similar).

hav1w.py

@@ -1,12 +1,13 @@
 import argparse
 import os
 import pathlib
+import shlex
 import subprocess
 
 import yaml
 
 # Hannes' AV1 wrapper script
-# Version 2.0.0
+# Version 2.0.1
 
 # This is a good guide for optimizing AV1 parameters with the AOM reference encoder:
 # https://www.reddit.com/r/AV1/comments/t59j32/encoder_tuning_part_4_a_2nd_generation_guide_to/
@@ -101,7 +102,7 @@ cmd += ["-b:a", preset["ba"], "-af", f"aformat=channel_layouts={preset['alayout'
 cmd += [args.output]
 
 if args.dry:
-    print(" ".join(cmd))
+    print(" ".join(list(map(lambda x:shlex.quote(x), cmd))))
     exit(0)
 
 p = subprocess.run(cmd)