chore(version): bump to `1.8.0` #59

Job	Run time
Unit_tests (4.0, macOS-latest)	14s
Unit_tests (3.4, windows-latest)	1m 44s
Unit_tests (jruby, macOS-latest)	1m 6s
Unit_tests (3.4, macOS-latest)	14s
Unit_tests (truffleruby, macOS-latest, false)	35s
Unit_tests (4.0, windows-latest)	1m 31s
Unit_tests (3.2, macOS-latest)	15s
Unit_tests (3.3, ubuntu-latest)	10s
Unit_tests (jruby, ubuntu-latest)	56s
Unit_tests (3.2, windows-latest)	1m 32s
Unit_tests (truffleruby, ubuntu-latest, false)	30s
Unit_tests (3.3, windows-latest)	1m 46s
Unit_tests (3.4, ubuntu-latest)	13s
Unit_tests (jruby, windows-latest)	2m 55s
Unit_tests (3.3, macOS-latest)	13s
Unit_tests (4.0, ubuntu-latest)	10s
Unit_tests (3.2, ubuntu-latest)	12s
Integration_tests (3.4, macOS-latest)	12s
Integration_tests (3.3, macOS-latest)	23s
Integration_tests (3.3, ubuntu-latest)	10s
Integration_tests (jruby, macOS-latest)	42s
Integration_tests (jruby, ubuntu-latest)	57s
Integration_tests (3.2, macOS-latest)	25s
Integration_tests (4.0, macOS-latest)	15s
Integration_tests (3.2, ubuntu-latest)	11s
Integration_tests (3.4, ubuntu-latest)	10s
Integration_tests (4.0, ubuntu-latest)	14s
Publish	0s
	17m 55s

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