message: Make DB::get_version_of_latest_snapshot public
diff: @@ -178,6 +178,9 @@ public:
  using version_type = _impl::History::version_type;
  using VersionID = realm::VersionID;
  + /// Returns the version of the latest snapshot.
  + version_type get_version_of_latest_snapshot();
  +
  /// Thrown by start_read() if the specified version does not correspond to a
  /// bound (or tethered) snapshot.
  struct BadVersion;
  @@ -441,9 +444,6 @@ private:
  version_type do_commit(Group&);
  void do_end_write() noexcept;
  - /// Returns the version of the latest snapshot.
  - version_type get_version_of_latest_snapshot();
  -
  // make sure the given index is within the currently mapped area.
  // if not, expand the mapped area. Returns true if the area is expanded.
  bool grow_reader_mapping(uint_fast32_t index);
  