Update travis config

Author: ADmad

.travis.yml

@@ -1,25 +1,19 @@
 language: php
 
-sudo: false
-
 php:
-  - 5.6
-  - 7.0
   - 7.2
-  - 7.3
-
-
+  - 7.4
 
 matrix:
   include:
-    - php: 7.3
+    - php: 7.2
       env: PHPCS=1
 
-before_script: composer install --prefer-dist --dev
+before_script: composer install
 
 script:
-  - sh -c "if [ '$PHPCS' != '1' ]; then vendor/bin/phpunit; fi"
-  - sh -c "if [ '$PHPCS' = '1' ]; then vendor/bin/phpcs -p -n --extensions=php --standard=vendor/cakephp/cakephp-codesniffer/CakePHP ./src ./tests; fi"
+  - if [[ $PHPCS != 1 ]]; then vendor/bin/phpunit; fi
+  - if [[ $PHPCS == 1 ]]; then vendor/bin/phpcs -p -n --extensions=php --standard=vendor/cakephp/cakephp-codesniffer/CakePHP ./src ./tests; fi
 
 notifications:
   email: false