add CC0 1.0 Universal in LICENSE
add CC0 1.0 Universal in LICENSE

fixes #23

pierreozoux/mailinabox,brocktice/mailinabox,b-deng/mailinabox,mail-in-a-box/mailinabox,pierreozoux/mailinabox,jprice/mailinabox,nstanke/mailinabox,hnk/mailinabox,b-deng/mailinabox,brocktice/mailinabox,nstanke/mailinabox,jmedding/mailinabox,choltha/mailinabox,choltha/mailinabox,nstanke/mailinabox,Neopallium/mailinabox,d5ve/mailinabox,pierreozoux/mailinabox,PortableTech/mailinabox,jjz/mailinabox,m4rcs/mailinabox,m4rcs/mailinabox,ianberinger/mailinabox,choltha/mailinabox,mail-in-a-box/mailinabox,mboersma/mailinabox,pichak/mailinabox,choltha/mailinabox,ianberinger/mailinabox,jprice/mailinabox,Neopallium/mailinabox,m4rcs/mailinabox,ianberinger/mailinabox,brocktice/mailinabox,jjz/mailinabox,Neopallium/mailinabox,mail-in-a-box/mailinabox,brocktice/mailinabox,mboersma/mailinabox,jjz/mailinabox,hnk/mailinabox,jprice/mailinabox,jmedding/mailinabox,jmedding/mailinabox,pichak/mailinabox,brocktice/mailinabox,hnk/mailinabox,PortableTech/mailinabox,d5ve/mailinabox,jmedding/mailinabox,jjz/mailinabox,mboersma/mailinabox,choltha/mailinabox,b-deng/mailinabox,hnk/mailinabox,pichak/mailinabox,b-deng/mailinabox,jmedding/mailinabox,m4rcs/mailinabox,pierreozoux/mailinabox,jjz/mailinabox,PortableTech/mailinabox,Toilal/mailinabox,nstanke/mailinabox,jprice/mailinabox,mboersma/mailinabox,PortableTech/mailinabox,PortableTech/mailinabox,Neopallium/mailinabox,nstanke/mailinabox,pichak/mailinabox,mboersma/mailinabox,mail-in-a-box/mailinabox,Neopallium/mailinabox,m4rcs/mailinabox,ianberinger/mailinabox,d5ve/mailinabox,d5ve/mailinabox,d5ve/mailinabox,Toilal/mailinabox,Toilal/mailinabox,ianberinger/mailinabox,b-deng/mailinabox,pierreozoux/mailinabox,Toilal/mailinabox,jprice/mailinabox