Merge pull request #55 from microsoft/user/ningli/build

Moving to agent pool 'VSEngSS-MicroBuild2019-1ES'.

Update build definition to use new PAT

Changes:

- Updated Brotli library to v1.0.7
- Bug fix: an out-of-bound compression level set in the configuration causes IIS crashes (#15)

Initial release of IIS Compression

IIS Compression is a bundle of two IIS compression scheme providers, iisbrotli.dll and iiszlib.dll, that expand IIS's capability to compress HTTP responses. iisbrotli.dll supports Brotli compression, while iiszlib.dll supports both Gzip and Deflate compression