移除php7.4相关测试

.travis.yml

@@ -6,7 +6,6 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - 7.4
 
 addons:
   chrome: stable
@@ -17,10 +16,6 @@ matrix:
 services:
   - mysql
 
-before_install:
-  - pecl install zip
-#  - echo "extension = libzip.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-
 install:
   - mysql -e 'create database if not exists laravel;'
   - travis_retry composer create-project --prefer-dist laravel/laravel laravel-tests