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Add a LICENSE file

Hi @5kbpers ,
Thanks for sharing a great example to learn how to use raft-rs.
Could you please add a LICENSE file to let us know under what open source license you distribute this.

Node could not join successfully when restarted

I tried a 3-node cluster. It seems work successfully. But when I restart one of the nodes in the cluster, the node couldn't join to cluster successfully.

The executed command is as follows:

$ ./kv-server -A 0.0.0.0:3001 -I 1 -s /tmp/kv1 -p "1=0.0.0.0:3001"
$ ./kv-server -A 0.0.0.0:3002 -I 2 -s /tmp/kv2 -p "1=0.0.0.0:3001,2=0.0.0.0:3002" -d 1
$ ./kv-server -A 0.0.0.0:3003 -I 3 -s /tmp/kv3 -p "1=0.0.0.0:3001,2=0.0.0.0:3002,3=0.0.0.0:3003" -d 1

Then stop the third node and restart it again with the following command, but the following error occurs:

$ ./kv-server -A 0.0.0.0:3003 -I 3 -s /tmp/kv3 -p "1=0.0.0.0:3001,2=0.0.0.0:3002,3=0.0.0.0:3003" -d 1
start server...
id = 3
port = 3003
add to raft cluster success
listening on 0.0.0.0:3003
I'm follower
thread '<unnamed>' panicked at ' to_commit 5 is out of range [last_index 0]', /Users/m-osuka/.cargo/registry/src/github.com-1ecc6299db9ec823/raft-0.4.3/src/raft_log.rs:248:13
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
thread 'grpc-poll-0' panicked at 'send message to raft error: sending on a closed channel', src/server/mod.rs:291:17

Is there any wrong in the above commands?

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