Enable ext-async @ Travis

.travis.yml

@@ -3,14 +3,11 @@ sudo: false
 language: php
 
 php:
-  - 7.0
-  - 7.1
-  - 7.2
   - nightly
 
 matrix:
-  allow_failures:
-    - php: nightly
+  # allow_failures:
+  #  - php: nightly
   fast_finish: true
 
 env:
@@ -20,6 +17,7 @@ before_install:
   - phpenv config-rm xdebug.ini || echo "No xdebug config."
 
 install:
+  - travis/install-async.sh
   - composer update -n --prefer-dist
   - wget https://github.com/php-coveralls/php-coveralls/releases/download/v1.0.2/coveralls.phar
   - chmod +x coveralls.phar

travis/install-async.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+wget https://github.com/concurrent-php/ext-async/archive/master.tar.gz -O /tmp/php-async.tar.gz -q
+
+mkdir php-async && tar -xf /tmp/php-async.tar.gz -C php-async --strip-components=1
+
+pushd php-async
+phpize
+./configure
+make
+make install
+popd
+
+echo "extension=async" >> "$(php -r 'echo php_ini_loaded_file();')"