feat[docs]: add Telegram badge to README.md

[rafael-abuawad]

What I did

Added Telegram badge

[rafael-abuawad]

@charles-cooper can we get this merged?

[charles-cooper]

looks like the windows build doesn't like the existence of that emoji

[charles-cooper]

this seems to be a pyinstaller issue, which i've raised upstream pyinstaller/pyinstaller#8865

[charles-cooper]

i have a fix in https://github.com/vyperlang/vyper/pull/4348/files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.07%. Comparing base (53f623b) to head (9ab17c6).
Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (53f623b) and HEAD (9ab17c6). Click for more details.

HEAD has 135 uploads less than BASE

Flag	BASE (53f623b)	HEAD (9ab17c6)
	136	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4342       +/-   ##
===========================================
- Coverage   91.37%   46.07%   -45.31%     
===========================================
  Files         112      112               
  Lines       15927    15927               
  Branches     2693     2693               
===========================================
- Hits        14554     7338     -7216     
- Misses        939     8032     +7093     
- Partials      434      557      +123     

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