Update .travis.yml to install 'transfer' package in AWS SDK

Author: igorcanadi

.travis.yml

@@ -32,7 +32,7 @@ before_script:
   # more FDs than the default limit.
   - ulimit -n 8192
   - pushd /tmp && wget https://github.com/aws/aws-sdk-cpp/archive/1.3.50.tar.gz -O /tmp/aws-sdk.tar.gz && tar -xvf /tmp/aws-sdk.tar.gz > /dev/null && popd
-  - pushd /tmp/aws-sdk-cpp-1.3.50 && cmake -DBUILD_ONLY="s3;kinesis" . && make -j4 all && sudo make install && popd
+  - pushd /tmp/aws-sdk-cpp-1.3.50 && cmake -DBUILD_ONLY="s3;kinesis;transfer" . && make -j4 all && sudo make install && popd
   # Install librdkafka
   - LIBRDKAFKA_VERSION=0.11.3
   - wget https://github.com/edenhill/librdkafka/archive/v${LIBRDKAFKA_VERSION}.tar.gz