Don't put taskwarrior commands to history

Since task IDs are dynamic in taskwarrior, commands like `task 4 delete`
and `task 4 done` can be destructive with hard-to-trace damage if
inadverently repeated.

Better to avoid that, even at cost of not remembering anything.

(Note that `task` without arguments is still remembered; there's no harm
in repeating that, and it still can be convenient eg. w/ ^L).

dotfiles/bash/main.bashrc

 
 HISTIGNORE="$HISTIGNORE:ls:ll:la:cd"
 HISTIGNORE="$HISTIGNORE:git dc:git st"
+HISTIGNORE="$HISTIGNORE:task *:git dc:git st"
 #export HISTIGNORE="$HISTIGNORE:se *:sc *"
 HISTSIZE=-1
 HISTFILESIZE=100000