Update codecov.yml

[limeng120]

add coverage limit

Description

What is the purpose of the change? Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Brief of your solution

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How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

[codecov-commenter]

Codecov Report

Merging #334 (8863dc6) into master (d4fb5dc) will increase coverage by 0.13%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   45.73%   45.87%   +0.13%     
==========================================
  Files         138      138              
  Lines       12295    12295              
==========================================
+ Hits         5623     5640      +17     
+ Misses       5518     5501      -17     
  Partials     1154     1154              

Impacted Files	Coverage Δ
kernel/consensus/base/driver/chained-bft/smr.go	41.33% <0.00%> (+0.74%)	:arrow_up:
bcs/consensus/xpoa/xpoa.go	52.28% <0.00%> (+1.01%)	:arrow_up:
bcs/consensus/tdpos/tdpos.go	48.82% <0.00%> (+1.87%)	:arrow_up:
bcs/consensus/tdpos/common.go	55.07% <0.00%> (+2.89%)	:arrow_up:
bcs/network/p2pv1/conn.go	61.22% <0.00%> (+6.12%)	:arrow_up:

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