remove setopt inc_append_history + append_history (#92)
remove setopt inc_append_history + append_history (#92)

The documentation for the [`share_history`](http://zsh.sourceforge.net/Doc/Release/Options.html) zsh option suggests that `inc_append_history` should not be set if `share_history` [is set](https://github.com/nicknisi/dotfiles/pull/92/files#diff-ab78951a7ee311fd2e4217e3ad7193d1R17).

Also, I believe it is unnecessary to set `append_history` if either `inc_append_history` or `share_history` has been set.
NerdPad/dotfiles,nicknisi/dotfiles,nicknisi/dotfiles,nicknisi/dotfiles,OctavianRotari/dotfiles,OctavianRotari/dotfiles