update convertmodel.com in readme

[daquexian]

点开链接会自动选择以 ncnn 为目标格式了

[codecov-io]

Codecov Report

Merging #2620 (7c22fe2) into master (5e4ea0b) will decrease coverage by 0.79%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2620      +/-   ##
==========================================
- Coverage   87.63%   86.83%   -0.80%     
==========================================
  Files         478      390      -88     
  Lines       92139    70951   -21188     
==========================================
- Hits        80743    61612   -19131     
+ Misses      11396     9339    -2057     

Impacted Files	Coverage Δ
src/allocator.cpp	71.30% <0.00%> (-5.01%)	⬇️
src/layer/x86/reshape_x86.cpp	90.39% <0.00%> (-3.62%)	⬇️
src/layer/crop.cpp	79.09% <0.00%> (-3.54%)	⬇️
src/layer/x86/scale_x86.cpp	91.91% <0.00%> (-3.43%)	⬇️
src/layer/x86/dropout_x86.cpp	91.89% <0.00%> (-3.35%)	⬇️
src/layer/x86/prelu_x86.cpp	92.18% <0.00%> (-3.19%)	⬇️
src/layer/x86/relu_x86.cpp	90.69% <0.00%> (-2.53%)	⬇️
src/layer/x86/hardswish_x86.cpp	94.11% <0.00%> (-2.44%)	⬇️
src/layer/x86/eltwise_x86.cpp	92.44% <0.00%> (-2.36%)	⬇️
src/layer/x86/hardsigmoid_x86.cpp	94.11% <0.00%> (-2.32%)	⬇️
... and 120 more

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[nihui]

好活！