Release 0.2.8

Update q192 to use real computed q192 value instead of truncated js value to have more precise values and closer to the real value mathematically.

Javascript Engine 2^192 computed value: 6277101735386681000000000000000000000000000000000000000000
Real value of 2^192: 6277101735386680763835789423207666416102355444464034512896