Fix typo in CONTRIBUTING.md
Fix typo in CONTRIBUTING.md

pozorvlak/growstuff,cesy/growstuff,Br3nda/growstuff,Br3nda/growstuff,Growstuff/growstuff,dv2/growstuff,Br3nda/growstuff,Growstuff/growstuff,pozorvlak/growstuff,yez/growstuff,dv2/growstuff,dv2/growstuff,yez/growstuff,yez/growstuff,Growstuff/growstuff,pozorvlak/growstuff,cesy/growstuff,dv2/growstuff,yez/growstuff,Br3nda/growstuff,cesy/growstuff,cesy/growstuff,Growstuff/growstuff,pozorvlak/growstuff