Fix codecov.io report URL in build tag

[BruceHaley]

URL in build tag is sometimes a 404. This fixes it. You can see a build tag URL here

[codecov-commenter]

Codecov Report

Merging #872 into master will decrease coverage by 0.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #872      +/-   ##
==========================================
- Coverage   57.92%   57.01%   -0.92%     
==========================================
  Files         214      214              
  Lines       15438    14848     -590     
  Branches     2078     2053      -25     
==========================================
- Hits         8943     8465     -478     
+ Misses       5936     5840      -96     
+ Partials      559      543      -16     

Impacted Files	Coverage Δ
packages/luis/src/commands/luis/index.ts	66.66% <0.00%> (-16.67%)	⬇️
...kages/qnamaker/src/commands/qnamaker/kb/publish.ts	85.71% <0.00%> (-14.29%)	⬇️
...aker/src/commands/qnamaker/endpointkeys/refresh.ts	85.71% <0.00%> (-14.29%)	⬇️
...ages/lu/src/parser/qna/alterations/qnaConverter.js	40.00% <0.00%> (-10.00%)	⬇️
packages/lu/src/parser/lu/qnaOptions.js	12.50% <0.00%> (-9.73%)	⬇️
packages/qnamaker/src/utils/qnamakerbase.ts	71.64% <0.00%> (-8.72%)	⬇️
packages/qnamaker/src/commands/qnamaker/query.ts	41.93% <0.00%> (-8.07%)	⬇️
...kages/qnamaker/src/commands/qnamaker/kb/replace.ts	79.31% <0.00%> (-7.65%)	⬇️
...ckages/qnamaker/src/commands/qnamaker/kb/delete.ts	86.95% <0.00%> (-6.80%)	⬇️
packages/plugins/src/commands/plugins/install.ts	34.48% <0.00%> (-6.55%)	⬇️
... and 97 more

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