Don't run Linux CI on 5.8 (HTML::Tagset) #379

Job	Run time
Build distribution	2m 16s
Coverage	1m 52s
HTTP/1.1 Keepalive Regression Test - see GH \# 14	4m 3s
5.10 on Linux	1m 26s
5.12 on Linux	1m 31s
5.14 on Linux	1m 28s
5.16 on Linux	1m 31s
5.18 on Linux	1m 30s
5.20 on Linux	1m 44s
5.22 on Linux	1m 45s
5.24 on Linux	1m 42s
5.26 on Linux	1m 44s
5.28 on Linux	1m 42s
5.30 on Linux	1m 40s
5.32 on Linux	1m 38s
5.34 on Linux	1m 32s
5.36 on Linux	1m 36s
5.38 on Linux	1m 36s
5.14 on windows-latest	7m 42s
5.14 on macos-latest	3m 19s
5.16 on windows-latest	7m 3s
5.16 on macos-latest	2m 36s
5.20 on windows-latest	5m 30s
5.18 on macos-latest	2m 29s
5.22 on windows-latest	5m 17s
5.20 on macos-latest	3m 2s
5.24 on windows-latest	4m 56s
5.22 on macos-latest	2m 24s
5.26 on windows-latest	5m 11s
5.24 on macos-latest	3m 12s
5.28 on windows-latest	4m 21s
5.26 on macos-latest	2m 25s
5.30 on windows-latest	5m 52s
5.28 on macos-latest	3m 10s
5.32 on windows-latest	4m 36s
5.30 on macos-latest	2m 8s
5.32 on macos-latest	2m 11s
5.34 on macos-latest	2m 23s
5.36 on macos-latest	2m 11s
5.38 on macos-latest	2m 13s
	1h 56m 27s

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