Update CI install to not specify architecture, as mdbook doesn't release linux-musl downloads

adamgreig · adamgreig · commit e268b5c697b8 · 2020-02-25T00:28:14.000Z
diff --git a/ci/install.sh b/ci/install.sh
@@ -12,8 +12,7 @@ main() {
         sh -s -- \
            --force \
            --git rust-lang/mdbook \
-           --tag $tag \
-           --target x86_64-unknown-linux-musl
+           --tag $tag
 
     rustup target add thumbv7em-none-eabihf
 
