Add comment about Zig 15 to readme (#170) #189

Job	Run time
prep-matrix	5s
Release test (ubuntu-latest)	2m 2s
Static analysis - engine	31s
Release test (macos-13)	4m 54s
Static analysis - forge	27s
Static analysis - expert_credo	59s
Release test (macos-14)	2m 34s
Dialyzer - forge	39s
Dialyzer - expert_credo	2m 43s
Static analysis - expert	31s
Dialyzer - engine	2m 33s
Dialyzer - expert	2m 28s
Test engine on OTP 27 / Elixir 1.17	1m 41s
Test engine on OTP 27 / Elixir 1.18	1m 38s
Test expert_credo on OTP 27 / Elixir 1.17	45s
Test engine on OTP 26 / Elixir 1.16	1m 35s
Test engine on OTP 28 / Elixir 1.18.4	1m 28s
Test expert_credo on OTP 27 / Elixir 1.18	25s
Test forge on OTP 26 / Elixir 1.18	50s
Test expert_credo on OTP 28 / Elixir 1.18.4	43s
Test expert_credo on OTP 26 / Elixir 1.17	42s
Test engine on OTP 26 / Elixir 1.18	1m 38s
Test forge on OTP 26 / Elixir 1.17	46s
Test forge on OTP 27 / Elixir 1.18	51s
Test expert_credo on OTP 26 / Elixir 1.16	39s
Test expert_credo on OTP 26 / Elixir 1.18	38s
Test forge on OTP 27 / Elixir 1.17	51s
Test forge on OTP 28 / Elixir 1.18.4	51s
Test forge on OTP 26 / Elixir 1.16	47s
Test engine on OTP 26 / Elixir 1.17	1m 29s
Test expert on OTP 27.3.4.1 / Elixir 1.17.3	2m 49s
	41m 32s

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