remove incubator footer (#250) #713

Job	Run time
Checks	4m 18s
Compile and test (2.12.18, 8)	9m 50s
Docs	5m 0s
Compile Benchmarks	3m 45s
Compile and test (2.12.18, 11)	6m 54s
Gradle tests	5m 53s
Maven tests	5m 16s
Compile and test (2.13.12, 8)	11m 14s
Compile and test (2.13.12, 11)	7m 6s
sbt scripted tests (gen-scala-server, 2.12)	11m 22s
Compile and test (3.3.1, 8)	7m 4s
sbt scripted tests (gen-java, 2.12)	7m 17s
Compile and test (3.3.1, 11)	7m 13s
	1h 32m 12s

Provide feedback