Remove redundant license info #632

Job	Run time
Checks	2m 1s
Compile Benchmarks	1m 27s
Compile and test (2.12.18, 8)	3m 40s
Docs	2m 39s
Compile and test (2.12.18, 11)	3m 38s
Maven tests	2m 56s
Gradle tests	3m 49s
Compile and test (2.13.12, 8)	4m 20s
Compile and test (2.13.12, 11)	4m 27s
sbt scripted tests (gen-scala-server, 2.12)	7m 57s
Compile and test (3.3.1, 8)	5m 48s
sbt scripted tests (gen-java, 2.12)	3m 7s
Compile and test (3.3.1, 11)	4m 44s
	50m 33s

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