message: Show users how to properly set dependencies in migration guide
diff: @@ -6,6 +6,20 @@ major releases of `cosmwasm`. Note that you can also view the
  ## 0.11 -> 0.12
  +- Update CosmWasm dependencies in Cargo.toml (skip the ones you don't use):
  +
  + ```
  + [dependencies]
  + cosmwasm-std = "0.12.0"
  + cosmwasm-storage = "0.12.0"
  + # ...
  +
  + [dev-dependencies]
  + cosmwasm-schema = "0.12.0"
  + cosmwasm-vm = "0.12.0"
  + # ...
  + ```
  +
  - In your contract's `.cargo/config` remove `--features backtraces`, which is
  now available in Rust nightly only:
  @@ -62,6 +76,20 @@ major releases of `cosmwasm`. Note that you can also view the
  ## 0.10 -> 0.11
  +- Update CosmWasm dependencies in Cargo.toml (skip the ones you don't use):
  +
  + ```
  + [dependencies]
  + cosmwasm-std = "0.11.0"
  + cosmwasm-storage = "0.11.0"
  + # ...
  +
  + [dev-dependencies]
  + cosmwasm-schema = "0.11.0"
  + cosmwasm-vm = "0.11.0"
  + # ...
  + ```
  +
  - Contracts now support any custom error type `E: ToString + From<StdError>`.
  Previously this has been `StdError`, which you can still use. However, you can
  now create a much more structured error experience for your unit tests that
  @@ -313,6 +341,20 @@ major releases of `cosmwasm`. Note that you can also view the
  ## 0.9 -> 0.10
  +- Update CosmWasm dependencies in Cargo.toml (skip the ones you don't use):
  +
  + ```
  + [dependencies]
  + cosmwasm-std = "0.10.0"
  + cosmwasm-storage = "0.10.0"
  + # ...
  +
  + [dev-dependencies]
  + cosmwasm-schema = "0.10.0"
  + cosmwasm-vm = "0.10.0"
  + # ...
  + ```
  +
  Integration tests:
  - Calls to `Api::human_address` and `Api::canonical_address` now return a pair
  @@ -349,12 +391,19 @@ Contracts:
  ## 0.8 -> 0.9
  -`dependencies`/`dev-dependencies` in `Cargo.toml`:
  +- Update CosmWasm dependencies in Cargo.toml (skip the ones you don't use):
  -- Replace `cosmwasm-schema = "0.8"` with `cosmwasm-schema = "0.9"`
  -- Replace `cosmwasm-std = "0.8"` with `cosmwasm-std = "0.9"`
  -- Replace `cosmwasm-storage = "0.8"` with `cosmwasm-storage = "0.9"`
  -- Replace `cosmwasm-vm = "0.8"` with `cosmwasm-vm = "0.9"`
  + ```
  + [dependencies]
  + cosmwasm-std = "0.9.0"
  + cosmwasm-storage = "0.9.0"
  + # ...
  +
  + [dev-dependencies]
  + cosmwasm-schema = "0.9.0"
  + cosmwasm-vm = "0.9.0"
  + # ...
  + ```
  `lib.rs`:
  