Drop bad testing method on old Symfony frameworks

This is actually obsolete since Symfony Flex, as you can now run Symfony 4.1 with more recent components.

Author: curry684

.travis.yml

@@ -17,26 +17,24 @@ services:
 matrix:
     fast_finish: true
     include:
-     - php: 7.2
-       env:
-         - SYMFONY_VERSION=4.1.13
-         - SYMFONY_DEPRECATIONS_HELPER=weak
      - php: 7.2
        env:
          - COMPOSER_FLAGS="--prefer-lowest"
-         - SYMFONY_DEPRECATIONS_HELPER=weak
+         - SYMFONY_DEPRECATIONS_HELPER=weak_vendors
      - php: 7.3
        env:
          - SYMFONY_VERSION=^4.4
-         - SYMFONY_DEPRECATIONS_HELPER=weak
+         - SYMFONY_DEPRECATIONS_HELPER=weak_vendors
      - php: 7.4
        env:
          - SYMFONY_VERSION=^4.4
-         - SYMFONY_DEPRECATIONS_HELPER=weak
+         - SYMFONY_DEPRECATIONS_HELPER=weak_vendors
      - php: 7.4
-       env: DEPENDENCIES=dev
+       env:
+         - DEPENDENCIES=dev
      - php: nightly
-       env: COMPOSER_FLAGS="--ignore-platform-reqs"
+       env:
+         - COMPOSER_FLAGS="--ignore-platform-reqs"
     allow_failures:
      - php: nightly
      - env: DEPENDENCIES=dev