Configure solargraph #1654

Job	Run time
rubocop	14s
tests (ubuntu-latest, 2.7)	24s
tests (ubuntu-latest, 3.0)	10s
tests (ubuntu-latest, 3.1)	9s
tests (ubuntu-latest, 3.2)	10s
tests (ubuntu-latest, head)	1m 13s
tests (ubuntu-latest, truffleruby-22.2)	1m 59s
tests (ubuntu-latest, truffleruby-22.3)	1m 52s
tests (ubuntu-latest, truffleruby-head)	1m 42s
tests (macos-latest, 2.7)	1m 1s
tests (macos-latest, 3.0)	18s
tests (macos-latest, 3.1)	33s
tests (macos-latest, 3.2)	21s
tests (macos-latest, head)	1m 37s
tests (macos-latest, truffleruby-22.2)	4m 59s
tests (macos-latest, truffleruby-22.3)	3m 37s
tests (macos-latest, truffleruby-head)	2m 28s
	22m 47s

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