upgrade travis-ci swoole version to 4.4.16

Author: inhere

.travis.yml

@@ -6,7 +6,7 @@ php:
  - 7.3
 
 install:
- - wget https://github.com/swoole/swoole-src/archive/v4.4.14.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 && make -j$(nproc) && make install && cd -
+ - wget https://github.com/swoole/swoole-src/archive/v4.4.16.tar.gz -O swoole.tar.gz && mkdir -p swoole && tar -xf swoole.tar.gz -C swoole --strip-components=1 && rm swoole.tar.gz && cd swoole && phpize && ./configure && make -j$(nproc) && make install && cd -
  - echo "extension = swoole.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
 
 before_script: