[commands] Add missing inspect import in converter.py
[commands] Add missing inspect import in converter.py

Rapptz/discord.py,lgkern/PriestPy,imayhaveborkedit/discord.py,rapptz/discord.py,mgardne8/discord.py,variablehair/Eggplantato,Harmon758/discord.py,Harmon758/discord.py,khazhyk/discord.py