added 0.18 section to changelog
added 0.18 section to changelog

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