* fix runtime.GOOS=="windows, add some test cases
test cases are still limited for flag
* update to latest fiber v2.4.0 & libwebp v1.2.0
manually test confirmed
* Add X-Compression-Rate on response header
* add test case for compression rate, change logging and other improvements
* move config to config.go, add header for safari and proxyMode, logging improvement
* update gitignore for remote-raw and coverage.txt
* Refine log level