Use python dotenv instead of env file

[aadibajpai]

Allows for both .env file and also just setting up the environment variable. Simplifies the code a bit too.

Updated the message in the init with the new delimiter.

Blackening.

[codecov[bot]]

Codecov Report

Merging #69 into master will increase coverage by 0.09%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   28.61%   28.70%   +0.09%     
==========================================
  Files           9        9              
  Lines         311      310       -1     
==========================================
  Hits           89       89              
+ Misses        222      221       -1     

Impacted Files	Coverage Δ
SwagLyricsBot/__init__.py	78.26% <ø> (ø)
SwagLyricsBot/general_commands.py	41.93% <ø> (ø)
SwagLyricsBot/swaglyrics_bot.py	0.00% <0.00%> (ø)

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[flabbet]

Good, it works