Change the return type of DehumanizeTo<TTargetEnum> to TTargetEnum
Change the return type of DehumanizeTo<TTargetEnum> to TTargetEnum

Added test, change exception description
Update readme.md
added CannotMapToTargetException for DehumanizeTo<Enum>
Merge branch 'dehumanize_enums'
fixed readme for DehumanizeTo<Enum>