Release v1.6.0

feature

e784ae5 Support set http proxy for gorush CLI.
4a43124 Initial proxy setting for web server.
3f2c6a3 Support coverage report.
96eb62f add coverage script.
bc6aeeb add https test.

bugs

3190668 find submodule folder using git list command.
dac36a7 remove unknown shorthand flag for docker command.