[maven-release-plugin] prepare release v1.9
[maven-release-plugin] prepare release v1.9

ldh0826/snakeyaml,ilantoren/snakeyaml,thinkofdeath/snakeyaml,virustotalop/snakeyaml,marcuskara/snakeyaml,votinhthieugia/snakeyaml,UcasRichard/snakeyaml,nxbdi/snakeyaml,cuizhennan/snakeyaml,mapiman/snakeyaml,yskumar007/snakeyaml,Akkrite/snakeyaml,yishenggudou/snakeyaml,mc-nekoneko/snakeyaml,joy32812/snakeyaml,Fighter777/snakeyaml,youxinren/snakeyaml,Mause/snakeyaml,jeremypepper/snakeyaml,RussellSpitzer/snakeyaml,yeison/snakeyaml,umeding/snakeyaml,AssafMashiah/assafmashiah-yaml,SorinS/snakeyaml