Use icmplib without root privileges

Step 1: adapt your code

To use icmplib without root privileges, you must set the privileged parameter to False on the ping and multiping functions, as well as their asynchronous variants and the low level classes.

By disabling this parameter, icmplib let the kernel handle some parts of the ICMP headers.

The traceroute function does not have this parameter. It should always be run as root to receive ICMP Time Exceeded messages from gateways.
Step 2: allow this feature on your operating system

On some Linux systems, you must allow this feature:
```
$ echo 'net.ipv4.ping_group_range = 0 2147483647' | sudo tee -a /etc/sysctl.conf
$ sudo sysctl -p
```
You can check the current value with the following command:
```
$ sysctl net.ipv4.ping_group_range
net.ipv4.ping_group_range = 0 2147483647
```
Since Ubuntu 20.04 LTS, this manipulation is no longer necessary.

Read more about ping_group_range on www.kernel.org

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