Drop gcc 4.9

Author: pfultz2

.travis.yml

@@ -73,18 +73,6 @@ matrix:
  sources:
  - ubuntu-toolchain-r-test
 
- - env: GCC_VERSION=4.9 ASAN=off LIBCXX=off
- os: linux
- compiler: gcc-4.9
- addons: &gcc49
- apt:
- packages:
- - g++-4.9
- - valgrind
- - python-pip
- sources:
- - ubuntu-toolchain-r-test
-
 install:
  - export CHECKOUT_PATH=`pwd`;
  - if [ -n "$GCC_VERSION" ]; then export CXX="g++-${GCC_VERSION}" CC="gcc-${GCC_VERSION}"; fi