0.1.1.0

• fixed index update bug: new references were added, but the ones from the previous version of the document were not removed
• added sort order argument to range queries
• lookup returns just Maybe a
• renamed lookupUnique to unique'
• renamed filter to filterRange
• renamed rangeK to range'
• changed argument order in range, range', filterRange to match SQL
• added unique
• added filter
• added filterRange', filter'

0.1.0.1

• fixed a GC bug: swapDb failed to swap

0.1

• initial release