shellfirm 0.3.7

`shellfirm` will intercept any risky patterns (default or defined by you) and prompt you a small challenge for double verification, kinda like a captcha for your terminal.
Documentation 
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- from: network
  test: iptables\s+-F
  description: "Flushing all firewall rules"
  id: network:flush_iptables
  severity: Critical
- from: network
  test: iptables\s+-X
  description: "Deleting all custom chains"
  id: network:delete_custom_chains
  severity: High
- from: network
  test: iptables\s+-t\s+nat\s+-F
  description: "Flushing all NAT rules"
  id: network:flush_nat_rules
  severity: High
- from: network
  test: ufw\s+disable
  description: "Disabling firewall"
  id: network:disable_firewall
  severity: Critical
- from: network
  test: ufw\s+--force\s+reset
  description: "Force resetting firewall rules"
  id: network:force_reset_firewall
  severity: Critical
- from: network
  test: systemctl\s+stop\s+networking
  description: "Stopping network service"
  id: network:stop_networking
  severity: High
- from: network
  test: systemctl\s+stop\s+NetworkManager
  description: "Stopping NetworkManager service"
  id: network:stop_network_manager
  severity: High
- from: network
  test: ifconfig\s+\w+\s+down
  description: "Bringing down network interface"
  id: network:bring_down_interface
  severity: High
- from: network
  test: ip\s+link\s+set\s+\w+\s+down
  description: "Bringing down network interface using ip command"
  id: network:bring_down_interface_ip
  severity: High
- from: network
  test: route\s+del\s+default
  description: "Deleting default route"
  id: network:delete_default_route
  severity: High