Remove travis install of SSH2 PHP extension

Author: DivineOmega

.travis.yml

@@ -6,9 +6,6 @@ php:
   - 7.3
 
 before_script:
-  - sudo apt-get update && sudo apt-get install libssh2-1 libssh2-1-dev -y
-  - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.3" ]]; then cd /tmp && git clone https://git.php.net/repository/pecl/networking/ssh2.git && cd /tmp/ssh2 && phpize && ./configure && make && make install; fi
-  - echo "extension=ssh2.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - cd $TRAVIS_BUILD_DIR
   - ssh-keygen -N '' -f ~/.ssh/id_rsa
   - cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys