update travis config

Author: fredemmott

.travis.sh

@@ -2,8 +2,6 @@
 set -ex
 hhvm --version
 echo hhvm.jit=0 >> /etc/hhvm/php.ini
-apt-get update -y
-apt-get install -y wget curl git
 curl https://getcomposer.org/installer | hhvm --php -- /dev/stdin --install-dir=/usr/local/bin --filename=composer
 
 cd /var/source

.travis.yml

@@ -3,8 +3,8 @@ language: generic
 services:
  - docker
 env:
- - HHVM_VERSION=3.15-lts-latest
  - HHVM_VERSION=3.18-lts-latest
+ - HHVM_VERSION=3.21-lts-latest
  - HHVM_VERSION=latest
 install:
  - docker pull hhvm/hhvm:$HHVM_VERSION