v.2.3.0

v2.3.0 - Fool-proof Update
Move version to a specific command (/version)
Users have the option of auto capitalize the input (fool-proof)
Add /exist command
Users now have to the option of adding lazy zeros (fool-proof)
Fix bug #10
Output the book name when a valid barcode is inputted (a.k.a. detailed booklist) (fool-proof, in case the book name doesn't match the ones inputting in-real-life)
log.txt no longer exists in the repo