rustc-dev has been temporarily removed

Author: tesuji

CONTRIBUTING.md

@@ -147,7 +147,7 @@ You can use [rustup-toolchain-install-master][rtim] to do that:
 
 ```bash
 cargo install rustup-toolchain-install-master
-rustup-toolchain-install-master --force -n master -c rustc-dev
+rustup-toolchain-install-master --force -n master
 rustup override set master
 cargo test
 ```

appveyor.yml

@@ -19,7 +19,7 @@ install:
     - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
     - del rust-toolchain
     - cargo install --git https://github.com/kennytm/rustup-toolchain-install-master --debug || echo "rustup-toolchain-install-master already installed"
-    - rustup-toolchain-install-master -f -n master -c rustc-dev
+    - rustup-toolchain-install-master -f -n master
     - rustup component add rustfmt --toolchain nightly & exit 0 # Format test handles missing rustfmt
     - rustup default master
     - set PATH=%PATH%;C:\Users\appveyor\.rustup\toolchains\master\bin

setup-toolchain.sh

@@ -11,5 +11,5 @@ if ! command -v rustup-toolchain-install-master > /dev/null; then
     --debug
 fi
 
-rustup-toolchain-install-master -f -n master -c rustc-dev
+rustup-toolchain-install-master -f -n master
 rustup override set master