prepare release of 0.22.1
prepare release of 0.22.1

madjar/cython,hhsprings/cython,mcanthony/cython,roxyboy/cython,dahebolangkuan/cython,achernet/cython,fabianrost84/cython,JelleZijlstra/cython,scoder/cython,hhsprings/cython,ChristopherHogan/cython,c-blake/cython,slonik-az/cython,marscher/cython,fabianrost84/cython,JelleZijlstra/cython,madjar/cython,hickford/cython,acrispin/cython,roxyboy/cython,mcanthony/cython,acrispin/cython,madjar/cython,mrGeen/cython,roxyboy/cython,JelleZijlstra/cython,fabianrost84/cython,andreasvc/cython,c-blake/cython,da-woods/cython,scoder/cython,hickford/cython,ChristopherHogan/cython,slonik-az/cython,madjar/cython,fabianrost84/cython,marscher/cython,c-blake/cython,slonik-az/cython,marscher/cython,andreasvc/cython,andreasvc/cython,cython/cython,scoder/cython,fabianrost84/cython,hhsprings/cython,acrispin/cython,mcanthony/cython,ChristopherHogan/cython,dahebolangkuan/cython,mrGeen/cython,JelleZijlstra/cython,mrGeen/cython,fperez/cython,fperez/cython,dahebolangkuan/cython,fperez/cython,roxyboy/cython,marscher/cython,hhsprings/cython,c-blake/cython,andreasvc/cython,achernet/cython,encukou/cython,encukou/cython,marscher/cython,achernet/cython,mcanthony/cython,cython/cython,hickford/cython,scoder/cython,JelleZijlstra/cython,fperez/cython,hickford/cython,c-blake/cython,encukou/cython,acrispin/cython,da-woods/cython,acrispin/cython,fperez/cython,cython/cython,dahebolangkuan/cython,mrGeen/cython,cython/cython,encukou/cython,encukou/cython,hickford/cython,da-woods/cython,slonik-az/cython,roxyboy/cython,madjar/cython,dahebolangkuan/cython,achernet/cython,da-woods/cython,mrGeen/cython,slonik-az/cython,mcanthony/cython,achernet/cython,andreasvc/cython,hhsprings/cython