Type should be computed before command

[pawamoy]

deactivate command from virtualenv will return none type if we compute it after execution, since the function unsets itself.

[pawamoy]

Done in https://github.com/Pawamoy/shell-history/commit/5edb67143a595c09d124a294b692397fb99e27cb.

Fields that are now computed before running the command:

• command (needed for command type)
• command type
• working directory (since command can change it)