v0.0.8

Changed

• return type of zeroed() from impl Init<T, E> to impl Init<T> (also removing the generic
  parameter E)
• removed the default error of try_[pin_]init!, now you always have to specify an error using
  ? Error at the end
• put InPlaceInit behind the alloc feature flag, this allows stable usage of the #![no_std]
  part of the crate

Full changes: v0.0.7...v0.0.8