fix URL

Author: japaric

ci/install.sh

@@ -17,7 +17,7 @@ main() {
     curl -L https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2?revision=bc2c96c0-14b5-4bb4-9f18-bceb4050fee7?product=GNU%20Arm%20Embedded%20Toolchain,64-bit,,Linux,7-2018-q2-update | tar --strip-components=1 -C gcc -xj
 
     mkdir qemu
-    curl -L https://github.com/japaric/qemu-bin/blob/master/14.04/qemu-system-arm-2.12.0 > qemu/qemu-system-arm
+    curl -L https://github.com/japaric/qemu-bin/raw/master/14.04/qemu-system-arm-2.12.0 > qemu/qemu-system-arm
     chmod +x qemu/qemu-system-arm
 
     rustup component add llvm-tools-preview