use standard cargo build to compile

README-Japanese.md

@@ -173,7 +173,7 @@ rustup update
 ```bash
 rustup install stable-i686-pc-windows-msvc
 rustup target add i686-pc-windows-msvc
-rustup run stable-i686-pc-windows-msvc cargo build --release
+cargo build --release --target=stable-i686-pc-windows-msvc
 ```
 
 ## macOSでのコンパイルの注意点

README.md

@@ -174,7 +174,7 @@ You can create 32-bit binaries on 64-bit Windows systems with the following:
 ```bash
 rustup install stable-i686-pc-windows-msvc
 rustup target add i686-pc-windows-msvc
-rustup run stable-i686-pc-windows-msvc cargo build --release
+cargo build --release --target=stable-i686-pc-windows-msvc
 ```
 
 ## Notes on compiling on macOS