* upgrade to Cosmos SDK v0.39.2 (#430)

* upgrade to Cosmos SDK v0.39.2-rc1

* update to cosmos-sdk v0.39.2 RC2

* update to rc3

* update to v0.39.2

* [Bugfix] Register wasm query failed error to sdkerrors (#436)

* register wasm query failed error code
* fix description for querier

* fix treasury indicators querier

* [Feature] append blocking conditions for `/txs` query with `--public` flag on LCD (#437)

* block querying genesis txs from public node
* update txs query blocking condition for public node

* hotfix memory leak in go-cosmwasm iterator

* Implement tax caps querier for all whitelisted denoms (#442)

* add tax_caps querier
* add client interface & swagger update

Co-authored-by: Paul Kim <paul@terra.money>

* [Hotfix] treasury empty epoch data (#445)

* prevent division by zero, even though no epoch data is stored

* add test case for empty epoch data

* apply review for v0.4.2

* add empty epoch data load test case

* running...