Add some exports to typedds.nim (#66)

datastore/typedds.nim

@@ -9,6 +9,8 @@ import pkg/chronos
 import pkg/chronos/futures
 
 import ./datastore
+import ./types
+import ./key
 
 ## Wrapper for Datastore with basic functionality of automatically converting
 ## stored values from some user defined type `T` to `seq[byte]` and vice-versa.
@@ -55,6 +57,8 @@ type
     next*: GetNext[T]
     dispose*: IterDispose
 
+export types, key, IterDispose, Key, Query, SortOrder, QueryEndedError
+
 # Helpers
 template requireDecoder*(T: typedesc): untyped =
   when not (compiles do: