Add middle usdc swap to EthPiptSwap.sol

[defi-dev]

No description provided.

[codecov-commenter]

Codecov Report

Merging #148 (cc5e1cf) into master (340e214) will decrease coverage by 0.17%.
The diff coverage is 88.61%.

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
- Coverage   89.76%   89.59%   -0.18%     
==========================================
  Files          64       64              
  Lines        4232     4295      +63     
  Branches      638      646       +8     
==========================================
+ Hits         3799     3848      +49     
- Misses        433      447      +14     

Impacted Files	Coverage Δ
contracts/EthPiptSwap.sol	90.47% <87.50%> (-3.84%)	⬇️
contracts/Erc20PiptSwap.sol	100.00% <100.00%> (ø)

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