Findomain v0.1.4

It's a release with big improvements and fixes. See the following notes:

Functional changes:

• Optional support for multiple APIs as been added (you can explicit tell that with the -a option).
• New APIs added: https://crt.sh, https://www.virustotal.com, https://api.sublist3r.com.
• Fix application panic when the server returns an error like timeouts or whatever other.
• Fix application panic when the JSON data obtained from the API can not be parsed correctly.
• Functions to get subdomains has been separated by APIs in order to improve code quality.
• Now findomain have less dependences (error_chain) as been removed.
• Deprecated code as been removed.

Miscellaneous:

• Added emojis to informative messages.