Erc777

[pegahcarter]

What I did

Created the Vyper equivalent of the ERC-777 standard

How I did it

Created examples/tokens/ERC77.vy and the interface vyper/interfaces/ERC777.py.

How to verify it

I used here and here for reference

Description for the changelog

Cute Animal Picture

[codecov-io]

Codecov Report

Merging #2242 (b5ab899) into master (3c5a809) will decrease coverage by 38.57%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #2242       +/-   ##
===========================================
- Coverage   85.35%   46.78%   -38.58%     
===========================================
  Files          84       85        +1     
  Lines        8536     8587       +51     
  Branches     2062     2077       +15     
===========================================
- Hits         7286     4017     -3269     
- Misses        744     4008     +3264     
- Partials      506      562       +56     

Impacted Files	Coverage Δ
vyper/interfaces/ERC777.py	0.00% <0.00%> (ø)
vyper/parser/events.py	6.89% <0.00%> (-86.63%)	:arrow_down:
vyper/parser/s_expressions.py	5.88% <0.00%> (-85.30%)	:arrow_down:
vyper/ast/natspec.py	14.81% <0.00%> (-83.96%)	:arrow_down:
vyper/cli/vyper_json.py	10.40% <0.00%> (-74.40%)	:arrow_down:
vyper/parser/external_call.py	10.41% <0.00%> (-73.96%)	:arrow_down:
vyper/cli/utils.py	18.42% <0.00%> (-73.69%)	:arrow_down:
vyper/signatures/event_signature.py	25.53% <0.00%> (-70.22%)	:arrow_down:
vyper/compiler/output.py	35.18% <0.00%> (-64.82%)	:arrow_down:
vyper/signatures/sig_utils.py	35.71% <0.00%> (-64.29%)	:arrow_down:
... and 56 more

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