Feature: parse multiple lines base 64 decoder

[simplestan1]

decoding a multi line encoded message does not work.

[peckz]

Thanks @simplestan1
I merged the fix. let me know if this PR solved the issue! #161

[simplestan1]

did not work for me

[peckz]

@simplestan1 All right, I'm gonna have another look, thank you!

[peckz]

@simplestan1 merged another PR into master. Works on my end! Thanks for reporting!

[simplestan1]

It works,thank you very much!