Updated AWS url for astyle.

The original one is no longer appropriate

Author: cmonr

.travis.yml

@@ -169,7 +169,7 @@ matrix:
         - NAME=astyle
       install:
         - >-
-          curl -L0 https://mbed-os.s3-eu-west-1.amazonaws.com/builds/deps/astyle_3.1_linux.tar.gz --output astyle.tar.gz;
+          curl -L0 https://mbed-os-ci.s3-eu-west-1.amazonaws.com/jenkins-ci/deps/astyle_3.1_linux.tar.gz --output astyle.tar.gz;
           mkdir -p BUILD && tar xf astyle.tar.gz -C BUILD;
           cd BUILD/astyle/build/gcc;
           make;