Bump version to 3.0-alpha
Bump version to 3.0-alpha

WARNING: This branch is unstable and should not be used in
production for the time being.
See https://godotengine.org/article/warning-head-going-unstable
for more details.

To get the previous 2.2-alpha unreleased version, you can checkout
the '2.2' branch.

jejung/godot,honix/godot,Faless/godot,DmitriySalnikov/godot,n-pigeon/godot,okamstudio/godot,pkowal1982/godot,josempans/godot,MrMaidx/godot,ficoos/godot,honix/godot,NateWardawg/godot,n-pigeon/godot,MrMaidx/godot,DmitriySalnikov/godot,BastiaanOlij/godot,vnen/godot,Marqin/godot,FateAce/godot,Valentactive/godot,godotengine/godot,groud/godot,okamstudio/godot,DmitriySalnikov/godot,josempans/godot,MarianoGnu/godot,mcanders/godot,guilhermefelipecgs/godot,ageazrael/godot,Max-Might/godot,vkbsb/godot,akien-mga/godot,okamstudio/godot,Max-Might/godot,mcanders/godot,ZuBsPaCe/godot,RandomShaper/godot,NateWardawg/godot,akien-mga/godot,Shockblast/godot,firefly2442/godot,sanikoyes/godot,ageazrael/godot,morrow1nd/godot,RandomShaper/godot,godotengine/godot,Zylann/godot,FateAce/godot,okamstudio/godot,FateAce/godot,josempans/godot,BastiaanOlij/godot,ageazrael/godot,firefly2442/godot,n-pigeon/godot,NateWardawg/godot,MrMaidx/godot,Faless/godot,josempans/godot,Paulloz/godot,vnen/godot,NateWardawg/godot,ficoos/godot,DmitriySalnikov/godot,FateAce/godot,BastiaanOlij/godot,MarianoGnu/godot,RebelliousX/Go_Dot,sanikoyes/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,morrow1nd/godot,groud/godot,vkbsb/godot,Paulloz/godot,vnen/godot,guilhermefelipecgs/godot,sanikoyes/godot,Faless/godot,Marqin/godot,Max-Might/godot,Zylann/godot,tomreyn/godot,NateWardawg/godot,exabon/godot,MrMaidx/godot,godotengine/godot,zicklag/godot,guilhermefelipecgs/godot,morrow1nd/godot,BastiaanOlij/godot,MarianoGnu/godot,akien-mga/godot,firefly2442/godot,zicklag/godot,vnen/godot,sanikoyes/godot,zicklag/godot,ageazrael/godot,exabon/godot,Valentactive/godot,ex/godot,groud/godot,ficoos/godot,tomreyn/godot,jejung/godot,Marqin/godot,morrow1nd/godot,RandomShaper/godot,Faless/godot,groud/godot,Max-Might/godot,vkbsb/godot,vkbsb/godot,okamstudio/godot,firefly2442/godot,zicklag/godot,Valentactive/godot,ex/godot,mcanders/godot,godotengine/godot,ZuBsPaCe/godot,pkowal1982/godot,RandomShaper/godot,exabon/godot,Paulloz/godot,Zylann/godot,MrMaidx/godot,Faless/godot,NateWardawg/godot,akien-mga/godot,Paulloz/godot,firefly2442/godot,akien-mga/godot,ex/godot,mcanders/godot,DmitriySalnikov/godot,pkowal1982/godot,BastiaanOlij/godot,honix/godot,MrMaidx/godot,Paulloz/godot,josempans/godot,zicklag/godot,honix/godot,pkowal1982/godot,Shockblast/godot,sanikoyes/godot,RebelliousX/Go_Dot,sanikoyes/godot,FateAce/godot,vkbsb/godot,MarianoGnu/godot,vkbsb/godot,Zylann/godot,tomreyn/godot,Shockblast/godot,exabon/godot,godotengine/godot,Shockblast/godot,MarianoGnu/godot,josempans/godot,Max-Might/godot,ficoos/godot,Brickcaster/godot,guilhermefelipecgs/godot,Brickcaster/godot,BastiaanOlij/godot,Shockblast/godot,Marqin/godot,okamstudio/godot,tomreyn/godot,ficoos/godot,honix/godot,guilhermefelipecgs/godot,Paulloz/godot,BastiaanOlij/godot,ex/godot,Faless/godot,akien-mga/godot,akien-mga/godot,zicklag/godot,Faless/godot,MarianoGnu/godot,guilhermefelipecgs/godot,ficoos/godot,Brickcaster/godot,okamstudio/godot,Shockblast/godot,Zylann/godot,mcanders/godot,RebelliousX/Go_Dot,mcanders/godot,honix/godot,ex/godot,vnen/godot,n-pigeon/godot,pkowal1982/godot,vnen/godot,n-pigeon/godot,firefly2442/godot,RandomShaper/godot,vkbsb/godot,godotengine/godot,josempans/godot,Brickcaster/godot,vnen/godot,ZuBsPaCe/godot,MarianoGnu/godot,Brickcaster/godot,ageazrael/godot,FateAce/godot,vnen/godot,RebelliousX/Go_Dot,Brickcaster/godot,pkowal1982/godot,Valentactive/godot,ex/godot,NateWardawg/godot,Max-Might/godot,MarianoGnu/godot,sanikoyes/godot,okamstudio/godot,Shockblast/godot,firefly2442/godot,DmitriySalnikov/godot,tomreyn/godot,Valentactive/godot,okamstudio/godot,Zylann/godot,ZuBsPaCe/godot,godotengine/godot,ZuBsPaCe/godot,Valentactive/godot,ageazrael/godot,josempans/godot,pkowal1982/godot,Faless/godot,BastiaanOlij/godot,n-pigeon/godot,ZuBsPaCe/godot,RebelliousX/Go_Dot,RebelliousX/Go_Dot,Marqin/godot,exabon/godot,exabon/godot,jejung/godot,NateWardawg/godot,jejung/godot,n-pigeon/godot,Brickcaster/godot,Valentactive/godot,Paulloz/godot,ZuBsPaCe/godot,morrow1nd/godot,Zylann/godot,morrow1nd/godot,godotengine/godot,jejung/godot,RandomShaper/godot,guilhermefelipecgs/godot,jejung/godot,okamstudio/godot,Valentactive/godot,Zylann/godot,ageazrael/godot,firefly2442/godot,pkowal1982/godot,groud/godot,groud/godot,Shockblast/godot,Marqin/godot,sanikoyes/godot,akien-mga/godot,RandomShaper/godot,vkbsb/godot,ex/godot,NateWardawg/godot,DmitriySalnikov/godot,ex/godot