update changelog for v1.3.1 changes #378

Job	Run time
Vim v8.2.1931 (ubuntu-latest)	1m 6s
Vim v8.2.1931 (macos-latest)	1m 54s
Stable and nightly (ubuntu-latest, stable, true)	16s
Neovim v0.4.4 (ubuntu-latest)	16s
Vim v8.2.1931 (windows-latest)	2m 2s
Neovim v0.4.4 (macos-latest)	58s
Stable and nightly (ubuntu-latest, stable, false)	28s
Neovim v0.4.4 (windows-latest)	1m 28s
Stable and nightly (ubuntu-latest, nightly, true)	16s
Stable and nightly (ubuntu-latest, nightly, false)	1m 5s
Vim v8.1.2424 on macOS	2m 18s
Stable and nightly (macos-latest, stable, true)	49s
Check unit tests and linter	30s
Stable and nightly (macos-latest, stable, false)	1m 37s
Stable and nightly (macos-latest, nightly, true)	58s
Stable and nightly (macos-latest, nightly, false)	2m 24s
Stable and nightly (windows-latest, stable, true)	1m 16s
Stable and nightly (windows-latest, stable, false)	1m 27s
Stable and nightly (windows-latest, nightly, true)	1m 25s
Stable and nightly (windows-latest, nightly, false)	1m 3s
Stable and nightly (macos-14, stable, true)	32s
Stable and nightly (macos-14, stable, false)	49s
Stable and nightly (macos-14, nightly, true)	21s
Stable and nightly (macos-14, nightly, false)	1m 3s
	26m 21s

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