as they are not required (not even recommended) to be set along with
`SHARE_HISTORY`. See zshoptions(1) on `SHARE_HISTORY`:
> This option ... also causes your typed commands to be appended to the
> history file (the latter is like specifying `INC_APPEND_HISTORY`,
> which should be turned off if this option is in effect). The history
> lines are also output with timestamps ala `EXTENDED_HISTORY` ...
Also update copy in comments and in the README. Stick with the following
style for the README:
* Header 1 with the module name is in `lowercase`.
* Other headers are in `Sentence case`. Common header names that should
be consistently used are `Aliases`, `Functions`, `Settings`, and
`Zsh options`.
* The names `Zim` and `Zsh` always appear capitalized, even in the
middle of sentences.
Closes#313
