0.2.1

Fixed:

• Fixed cache inconsistency when factory function create() throws an exception.

0.2.0

Added:

• Added get overloads thats consume the Key&&.

Changed:

• Changed the Value that can be created by a factory. It now must use
  std::enable_shared_from_this (or equivalently implement
  shared_from_this()).

• Changed how values are stored in the factory cache. They are now stored as
  const Value* and not as std::weak_ptr<Value> anymore.

• Changed required C++ version. Now we need at least C++17.

Performance:

• Improved get which now uses only a single lookup and create call.

0.1.1

Fixed:

• Fixed a segfault when a factory gets destroyed before all its elements.

0.1.0

Added:

• Added release setup with rever.

• Added template argument to UniqueFactory to keep weak pointers alive even
  if all shared pointers to them have gone out of scope.

Changed:

• Moved header file to unique-factory/unique-factory.hpp.