message: Fix migration guide
diff: @@ -11,9 +11,9 @@ major releases of `cosmwasm`. Note that you can also view the
  `Cargo.toml` dependencies:
  - Update to `schemars = "0.7"`
  -- Replace `cosmwasm = "0.7"` with `cosmwasm_std = "0.8"`
  -- Replace `cosmwasm_vm = "0.7"` with `cosmwasm_vm = "0.8"`
  -- Replace `cw_storage = "0.2"` with `cosmwasm_storage = "0.8"`
  +- Replace `cosmwasm = "0.7"` with `cosmwasm-std = "0.8"`
  +- Replace `cosmwasm-vm = "0.7"` with `cosmwasm-vm = "0.8"`
  +- Replace `cw-storage = "0.2"` with `cosmwasm-storage = "0.8"`
  - Remove explicit `snafu` dependency. `cosmwasm_std` still uses it internally
  but doesn't expose snafu specifics anymore. See more details on errors below.
  @@ -87,7 +87,8 @@ Contract Code:
  tests.
  - `Utf8Err`/`Utf8StringErr` merged into `StdError::InvalidUtf8`
  - `Base64Err` renamed into `StdError::InvalidBase64`
  - - `ContractErr`/`DynContractErr` merged into `StdError::GeneralErr`
  + - `ContractErr`/`DynContractErr` merged into `StdError::GenericErr`, thus both
  + `contract_err` and `dyn_contract_err` must be replaced with `generic_err`.
  - The unused `ValidationErr` was removed
  At this point `cargo wasm` should pass.
  @@ -105,13 +106,14 @@ Both:
  `Coin::new` and returns one `Coin`.
  - Remove the 4th argument (contract balance) from all calls to `mock_env`, this
  is no longer stored in the environment.
  -- `mock_dependencies` and `mock_instance` take a 2nd argument to set the
  - contract balance (visible for the querier). If you need to set more balances,
  - use `mock_XX_with_balances`. The follow code block explains:
  +- `dependencies` was renamed to `mock_dependencies`. `mock_dependencies` and
  + `mock_instance` take a 2nd argument to set the contract balance (visible for
  + the querier). If you need to set more balances, use `mock_XX_with_balances`.
  + The follow code block explains:
  ```rust
  // before: balance as last arg in mock_env
  - let mut deps = mock_dependencies(20);
  + let mut deps = dependencies(20);
  let env = mock_env(&deps.api, "creator", &coins(15, "earth"), &coins(1015, "earth"));
  // after: balance as last arg in mock_dependencies
  