Updated README to include snapshot command (#8129)

Summary:
* Added text for `below snapshot` command
* Fixed below logo in readme

Pull Request resolved: https://github.com/facebookincubator/below/pull/8129

Reviewed By: brianc118

Differential Revision: D34527756

Pulled By: chippermist

fbshipit-source-id: 92c20781def5c0a6227a498cd47ed7043266ffd1

1 files changed, 2 insertions, 1 deletions

diff --git a/README.md b/README.md
index d55fc500..b7ecb13c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-![below](https://github.com/facebookincubator/below/main/img/below_logo_horizontal.png)
+![below](https://github.com/facebookincubator/below/blob/main/img/below_logo_horizontal.png)
 
 [![CI](https://github.com/facebookincubator/below/workflows/CI/badge.svg)](https://github.com/facebookincubator/below/actions?query=workflow%3ACI+branch%3Amain+)
 [![Matrix chat](https://img.shields.io/matrix/below:matrix.org)](https://matrix.to/#/#below:matrix.org)
@@ -14,6 +14,7 @@ has support for:
 * `replay` mode to replay historical system data
 * `live` mode to view live system data
 * `dump` subcommand to report script-friendly information (eg JSON and CSV)
+* `snapshot` subcommand to create a replayable snapshot file of historical system data
 
 below does **not** have support for cgroup1.