Fix toolchain download link

.travis.yml

@@ -40,7 +40,7 @@ install:
     fi
   - if [ $ARCH = aarch64 ]; then
     if [ $TRAVIS_OS_NAME = linux ]; then
-      wget https://developer.arm.com/-/media/Files/downloads/gnu-a/8.2-2018.11/gcc-arm-8.2-2018.11-x86_64-aarch64-elf.tar.xz?revision=90d1fe0a-42d7-439c-8ea6-bb7234b2f540&la=en -O gcc-arm-8.2-2018.11-x86_64-aarch64-elf.tar.xz;
+      wget https://developer.arm.com/-/media/Files/downloads/gnu-a/8.2-2018.11/gcc-arm-8.2-2018.11-x86_64-aarch64-elf.tar.xz;
       tar -xvf gcc-arm-8.2-2018.11-x86_64-aarch64-elf.tar.xz;
       export PATH=$PATH:$PWD/gcc-arm-8.2-2018.11-x86_64-aarch64-elf/bin;
     elif [ $TRAVIS_OS_NAME = osx ]; then