v4.0.0

Changelog

• 6d0d642 chore: add app test (#24)
• 0e8ab2b chore: add balance querier and tendermint test (#23)
• 1e14e5f chore: add basic tests (#18)
• fa6cd5b chore: add cmd test (#20)
• 95238ff chore: add config test (#21)
• 9000fcb chore: add http client test (#19)
• 8782e19 chore: add queriers test (#22)
• e34ff9a feat: use denom exponent (#25)