[maven-release-plugin] prepare release RoaringBitmap-0.6.38
[maven-release-plugin] prepare release RoaringBitmap-0.6.38

okrische/RoaringBitmap,RoaringBitmap/RoaringBitmap,RoaringBitmap/RoaringBitmap,okrische/RoaringBitmap,lemire/RoaringBitmap,RoaringBitmap/RoaringBitmap,RoaringBitmap/RoaringBitmap,lemire/RoaringBitmap,lemire/RoaringBitmap,okrische/RoaringBitmap,lemire/RoaringBitmap