add to arrays in a more portable way

[LucasLarson]

Proposal

undo

cb371c4

dotfiles/.zshrc

Lines 93 to 96 in cb371c4

	plugins+=(
	git
	gunstage
	)

a8240df

dotfiles/.zshrc

Lines 95 to 97 in a8240df

	plugins+=(
	zsh-syntax-highlighting
	)

---

rationale α.

both

path=(addition "${path[@]}")

and

path=("${path[@]}" addition)

become possible

rationale ⅰ.

moreover, “In POSIX sh, += is undefined” (SC3024)