Wrong check for the group name check

[nus-pe-bot]

bts is not BTS it should be capital sensitive.

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_{[original: nus-cs2103-AY1920S1/pe-interim#1343]}

[e0031374]

Team's Response

the command has stated group bts has already existed in the group book, you cannot create a group with the same name in the group book, not a bug and at most is a low severity documentation issue as no where is it stated it should be capital sensitive and given the nature of the command response it can be inferred that it is not meant to be capital sensitive

Duplicate status (if any):

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