Merge pull request #9 from bw-company/creasty/syntax

Fix field options syntax

Merge pull request #8 from bw-company/creasty/fix_case

Creasty/fix case

Merge pull request #6 from bw-company/creasty/remove_union

Abolish union type completely

Merge pull request #4 from bw-company/creasty/oneof

Ensure union types only consist of object types