This no longer supports Fish 2.2.0

[faho]

Since 029a675, this uses the string builtin in omf.packages.install:

https://github.com/oh-my-fish/oh-my-fish/blame/d427501b2c3003599bc09502e9d9535b5317c677/pkg/omf/functions/packages/omf.packages.install.fish#L22

That was only introduced in fish 2.3.0 (and it's possible this specific usage only worked in an even later version), which means this won't work in fish 2.2.0 - unlike the badge in the README claims.

It is possible to replace this with grep, but frankly, given that fish 2.3.0 is 7 years old, and that 67% of all commits to fish happened since then, I don't believe it is a good use of the already very limited time of the omf contributors.

Specifically, this will be awkward to new contributors because they'll very likely not know how to support a version that old, and how you would write good fish script has changed a fair bit since then - string, argparse, math, ...

So I would suggest increasing the minimum supported version. See repology for which fish versions are in use by distributions, where you'll find very few still in-support versions that have fish < 3.0.

And see this handy table for how many commits there have been since each release (excluding patch releases):

release	commits since the previous	percent of commits to 3.6.1 missing	number of commits missing	release date
3.6.1	129	0%	0	2023-03-25
3.6.0	780	0.8%	129	2023-01-07
3.5.0	433	5.6%	933	2022-06-16
3.4.0	1106	8.2%	1375	2022-03-12
3.3.0	435	15%	2504	2021-06-28
3.2.0	2177	18.1%	3028	2021-03-01
3.1.0	2210	31.6%	5296	2020-02-12
3.0.0	1808	45.2%	7576	2018-12-28
2.7.0	418	56.1%	9387	2017-11-23
2.6.0	410	58.6%	9805	2017-06-03
2.5.0	350	61%	10215	2017-02-03
2.4.0	673	63.1%	10565	2016-11-08
2.3.0	801	67.4%	11292	2016-05-20
2.2.0	1301	72.2%	12093	2015-07-06