Require pwasm-utils-cli v0.6.0 in README

.travis.yml

@@ -4,7 +4,7 @@ rust:
   - nightly
 before_install:
   - rustup target add wasm32-unknown-unknown
-  - command -v wasm-build || cargo install pwasm-utils-cli --bin wasm-build
+  - command -v wasm-build || cargo install pwasm-utils-cli --version 0.6.0 --bin wasm-build
   - ./wasm-install.sh
 env:
   - TUTOR_DIR=step-0

README.md

@@ -14,9 +14,9 @@ rustup target add wasm32-unknown-unknown
 ```
 
 ### Parity wasm-build
-[wasm-build](https://github.com/paritytech/wasm-utils#build-tools-for-cargo) takes the raw `.wasm` file produced by Rust compiler and packs it to the form of valid contract.
+[wasm-build](https://github.com/paritytech/wasm-utils#build-tools-for-cargo) takes the raw `.wasm` file produced by Rust compiler and packs it to the form of valid contract. You will need version `0.6.0` for this tutorial to work.
 ```
-cargo install pwasm-utils-cli --bin wasm-build
+cargo install pwasm-utils-cli --version 0.6.0 --bin wasm-build
 ```
 
 ### Parity

step-0/build.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 
 cargo build --release --target wasm32-unknown-unknown
-wasm-build --target=wasm32-unknown-unknown ./target pwasm_tutorial_contract
+wasm-build --target=wasm32-unknown-unknown --skip-optimization ./target pwasm_tutorial_contract

step-1/build.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 
 cargo build --release --target wasm32-unknown-unknown
-wasm-build --target=wasm32-unknown-unknown ./target pwasm_tutorial_contract
+wasm-build --target=wasm32-unknown-unknown --skip-optimization ./target pwasm_tutorial_contract