Merge pull request #630 from dfinity-berestovskyy/andriy/update-rust-hello

Update `rust/hello` example

Author: sesi200

.github/workflows/rust-hello-example.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Darwin
-        run: bash .github/workflows/provision-darwin.sh
+        run: DFX_VERSION="0.15.2" bash .github/workflows/provision-darwin.sh
       - name: Rust Hello Darwin
         run: |
           dfx start --background
@@ -30,7 +30,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Linux
-        run: bash .github/workflows/provision-linux.sh
+        run: DFX_VERSION="0.15.2" bash .github/workflows/provision-linux.sh
       - name: Rust Hello Linux
         run: |
           dfx start --background