Remove redundant `new` keywords from README.md

[codecov-commenter]

Codecov Report

Merging #227 (0cdb939) into master (4b809ec) will decrease coverage by 2.50%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
- Coverage   71.41%   68.91%   -2.51%     
==========================================
  Files          53       53              
  Lines        2183     2184       +1     
==========================================
- Hits         1559     1505      -54     
- Misses        624      679      +55     

Impacted Files	Coverage Δ
lib/src/contracts/generated_contract.dart	0.00% <0.00%> (-42.86%)	:arrow_down:
test/infura_integration_test.dart	53.33% <0.00%> (-40.01%)	:arrow_down:
lib/src/generated/erc20.g.dart	0.00% <0.00%> (-15.52%)	:arrow_down:
lib/src/core/client.dart	5.44% <0.00%> (-12.93%)	:arrow_down:
lib/src/contracts/deployed_contract.dart	0.00% <0.00%> (-10.00%)	:arrow_down:
lib/src/contracts/abi/abi.dart	88.88% <0.00%> (-5.56%)	:arrow_down:
lib/src/credentials/address.dart	74.35% <0.00%> (-5.13%)	:arrow_down:
lib/src/core/filters.dart	17.94% <0.00%> (-3.85%)	:arrow_down:
test/contracts/abi/functions_test.dart	100.00% <0.00%> (ø)

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[simolus3]

Thanks!