simpify master action

.github/workflows/master.yml

@@ -24,11 +24,6 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: nightly-2020-05-07
-        components: rustfmt
-        target: wasm32-unknown-unknown
-        override: true
-        default: true
     - name: Install cargo-unleash
       run: cargo install cargo-unleash --version 1.0.0-alpha.10 #FIXME: change to release once it's ready
     - name: Cargo unleash check