Upstream travis ci config (swoft-cloud/swoft-component#160)

* Update components travis ci config

Author: huangzhhui

.travis.yml

@@ -3,6 +3,7 @@ language: php
 php:
   - 7.0
   - 7.1
+  - 7.2
 
 services:
     - mysql
@@ -12,7 +13,9 @@ before_install:
 
 install:
   - wget https://github.com/redis/hiredis/archive/v0.13.3.tar.gz -O hiredis.tar.gz && mkdir -p hiredis && tar -xf hiredis.tar.gz -C hiredis --strip-components=1 && cd hiredis && sudo make -j$(nproc) && sudo make install && sudo ldconfig && cd ..
-  - pecl install -f swoole-2.0.12
+  - echo 'no' | pecl install -f redis
+  - wget https://github.com/swoole/swoole-src/archive/v4.0.2.tar.gz -O swoole.tar.gz && mkdir -p swoole && tar -xf swoole.tar.gz -C swoole --strip-components=1 && rm swoole.tar.gz && cd swoole && phpize && ./configure --enable-async-redis && make -j$(nproc) && make install && cd -
+  - echo "extension = swoole.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
 
 before_script:
   - composer update