Add validation to package name upon init. (#1425)
Add validation to package name upon init. (#1425)


seripap/emojiless-yarn,lawliet89/yarn,CHECK24/yarn,dguo/yarn,MiguelAlho/yarn,mvestergaard/yarn,mgcrea/yarn,mourner/yarn,mourner/yarn,ConAntonakos/yarn,bsansouci/esy,kasperlewau/yarn,mvestergaard/yarn,ConAntonakos/yarn,suitupalex/yarn,andreypopp/esy,onemen/yarn,andreypopp/esy,onemen/yarn,suitupalex/yarn,lawliet89/yarn,mgcrea/yarn,MiguelAlho/yarn,andreypopp/esy,CHECK24/yarn,joeyespo/yarn,bsansouci/esy,joeyespo/yarn,seripap/emojiless-yarn,kasperlewau/yarn,dguo/yarn,bsansouci/esy