React to CoreCLR update

[ycrumeyrolle]

Update to the latest published sdk 3.0.100-preview3-010431

[codecov-io]

Codecov Report

Merging #64 into master will increase coverage by 0.32%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage    99.1%   99.42%   +0.32%     
==========================================
  Files          30       56      +26     
  Lines        3116     4900    +1784     
==========================================
+ Hits         3088     4872    +1784     
  Misses         28       28

Impacted Files	Coverage Δ
...64.Tests/Internal/Vector256HelperTests/LessThan.cs	100% <100%> (ø)
source/gfoidl.Base64/ThrowHelper.cs	100% <0%> (ø)	⬆️
...sts/Internal/Vector128HelperTests/ReadVector128.cs	100% <0%> (ø)
...sts/Internal/Vector256HelperTests/ReadVector256.cs	100% <0%> (ø)
...foidl.Base64.Tests/Base64Tests/DetectEncoding_T.cs	100% <0%> (ø)
....Tests/Internal/Base64EncoderTests/EncodingMaps.cs	100% <0%> (ø)
...ts/Internal/Vector256HelperTests/WriteVector256.cs	100% <0%> (ø)
tests/gfoidl.Base64.Tests/Base64Tests/Url.cs	100% <0%> (ø)
...ernal/Base64UrlEncoderTests/GetMaxDecodedLength.cs	100% <0%> (ø)
.../gfoidl.Base64.Tests/Base64Tests/DetectEncoding.cs	100% <0%> (ø)
... and 18 more

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[gfoidl]

Thanks!