Add a .gitignore to serde2_macros
Add a .gitignore to serde2_macros

oli-obk/rust-serde,Ticki/serde,3Hren/serde,eefriedman/serde,Hoverbear/serde,erickt/serde,csmulhern/serde,Byron/serde,tempbottle/serde,JohnHeitmann/serde,pcwalton/serde,infinityb/serde,jmesmon/serde,sidred10/serde,serde-rs/serde,skade/serde,thorbenk/serde