Isn't doing anything?

[CertainLach]

Trying to use it:

$ java -jar bon.jar --inputJar orig-minecraft.jar --mappingsVer 1.12-snapshot_20180611
Bearded Octo Nemesis v2.4.0.14 by Parker8283. BON v1 by immibis.
Input JAR:       orig-minecraft.jar
Output JAR:      orig-minecraft-deobf.jar
Mappings:        1.12-snapshot_20180611
Gradle User Dir: /home/f6cf/.gradle
Reading in mappings: fields.csv
Reading in mappings: methods.csv
Loading Input JAR
Remapping
Writing remapped JAR
Done!

And getting the same jar in output