NEWS: finalize release 0.5.0
NEWS: finalize release 0.5.0

hiunnhue/libchewing,chewing/libchewing,bbyykk/libtaigi,cwlin/libchewing,chewing/libchewing,PeterDaveHello/libchewing,ShengYenPeng/libchewing,bbyykk/libtaigi,PeterDaveHello/libchewing,yan12125/libchewing,PeterDaveHello/libchewing,cwlin/libchewing,chewing/libchewing,bbyykk/libtaigi,hiunnhue/libchewing,ShengYenPeng/libchewing,Chocobo1/libchewing,bbyykk/libtaigi,cwlin/libchewing,PeterDaveHello/libchewing,yan12125/libchewing,Chocobo1/libchewing,ShengYenPeng/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,Chocobo1/libchewing,bbyykk/libtaigi,hiunnhue/libchewing,cwlin/libchewing,hiunnhue/libchewing,ShengYenPeng/libchewing,yan12125/libchewing,Chocobo1/libchewing,cwlin/libchewing,chewing/libchewing,yan12125/libchewing