Obsolete compiler errors in Unity 6.5

[jasonpanosso]

Fixed by #135

Package triggers obsolete compiler errors in Unity 6.5 beta. With 6.5 likely moving out of beta and into stable soon, it would be nice for #135 to be reviewed/merged & a new version of Alchemy with the fix released.

[conde2]

Tested #135 and its working just fine, I belive its good to merge.