Readme: fix gitter link, add Nim logo, formatting fixes #116

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
nim_test (ubuntu-latest, 1.6.12)	36s
nim_test (macos-latest, 1.6.12)	10m 31s
nim_test (windows-latest, 1.6.12)	2m 19s
	13m 26s