Version 0.9.15

The following updates have been made:

• For the --chromatic option, the tool now automatically removes multi-edges on the input graph. Thanks to Alan Sokal for pointing out this bug.

• For the `–chromatic1 option, the tool now reports the result as zero if the input graph contains a loop, and outputs an error message as well.

• For the --cache-stats option, a bug was fixed for large graphs which caused arithmetic overflow of the counters. Thanks to Gary for pointing out this bug.

• Added --stdin option to allow reading graphs from stdin, rather than a file.