Update Pair, PairDaily and PairHourly volumeToken0 and volumeToken1 properties #61
Description
Currently properties on volumeToken0 and volumeToken1 on the entites Pair, PairDaily and PairHourly are being expressed on atoms.
Rewrite them for being expressed using decimals of each token depending on the ERC-20 decimals property.
For example:
now we have volume token 100000000000000000 and we need to express that as 0.1.