hello message on guild join

[pratishrai]

No description provided.

[codecov]

Codecov Report

Merging #50 into master will decrease coverage by 0.54%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   28.70%   28.16%   -0.55%     
==========================================
  Files           9        9              
  Lines         310      316       +6     
==========================================
  Hits           89       89              
- Misses        221      227       +6     

Impacted Files	Coverage Δ
SwagLyricsBot/swaglyrics_bot.py	0.00% <0.00%> (ø)

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[flabbet]

Get rid of double hello. And also I think it should show directly basic commands instead of prompting to type $help