Fix support virtualenv

[francescpuig7]

It is necessary to escape ALL the non-printable characters so you can bash it correctly.
It is necessary to escape the full character (\e[0;31m) by using: \[...\], with "\[\e[0;31m\], because it only takes up the first semicolon ;
Otherwise, you can not find the entire non-printable character, and the bash does not have a normal behavior.

Ex when you print a long line:

(name_virtualenv) user@user-pc:~$ aa
aaaaairtualenv) user@user-pc:~$ aaaaaaaaaaaaaaaaaaaaaaaa

Now, this causes the non-printable characters to escape correctly:

(name_virtualenv) user@user-pc:~$ aaaaaaaaaaaaaaaaaaaaaaaaaaaaa