Update .travis.yml

Author: pascalbaljet

.travis.yml

@@ -6,10 +6,6 @@ cache:
 
 matrix:
   include:
-    - php: 7.4
-      env: LARAVEL='6.*' TESTBENCH='4.*' COMPOSER_FLAGS='--prefer-lowest'
-    - php: 7.4
-      env: LARAVEL='6.*' TESTBENCH='4.*' COMPOSER_FLAGS='--prefer-stable'
     - php: 7.4
       env: LARAVEL='7.*' TESTBENCH='5.*' COMPOSER_FLAGS='--prefer-lowest'
     - php: 7.4