Removed IntelliJ plugin block from readme #1008

Job	Run time
build-jvm-matrix	3s
build (ubuntu-latest, 21)	9m 19s
build (ubuntu-latest, 17)	10m 8s
build (ubuntu-latest, 11)	11m 16s
build (ubuntu-latest, 8)	9m 22s
build (windows-latest, 21)	13m 3s
build (windows-latest, 17)	13m 46s
build (windows-latest, 11)	14m 27s
build (windows-latest, 8)	12m 15s
check_samples (ubuntu-latest)	1m 55s
check_bashisms	2m 11s
check_samples (windows-latest)	2m 36s
	1h 40m 21s

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