Custom attributes: removing travis configs for PHP <7.1

.travis.yml

@@ -14,24 +14,14 @@ addons:
 
 matrix:
     include:
-        - php: 5.6
-          env: TEST_CONFIG="phpunit.xml"
-        - php: 7.0
-          env: TEST_CONFIG="phpunit.xml"
         - php: 7.2
           env: TEST_CONFIG="phpunit.xml" CHECK_CS=true
-        - php: 7.0
-          env: TEST_CONFIG="phpunit-integration-legacy.xml"
-        - php: 5.6
-          env: TEST_CONFIG="phpunit-integration-legacy-solr.xml" SOLR_VERSION="4.10.4" CORES_SETUP="single" SOLR_CORES="collection1" SOLR_CONFIG="vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/schema.xml vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/custom-fields-types.xml vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/language-fieldtypes.xml"
         - php: 7.1
           env: TEST_CONFIG="phpunit-integration-legacy-solr.xml" SOLR_VERSION="6.6.0" CORES_SETUP="shared" SOLR_CONFIG="vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/schema.xml vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/custom-fields-types.xml vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/language-fieldtypes.xml"
         - php: 7.1
           env: TEST_CONFIG="phpunit-integration-legacy-empty-db.xml" DB="postgresql" DATABASE="pgsql://postgres@localhost/testdb"
         - php: 7.1
           env: TEST_CONFIG="phpunit-integration-legacy-empty-db.xml" DB="mysql" DATABASE="mysql://root@localhost/testdb"
-        - php: 7.0
-          env: TEST_CONFIG="phpunit.xml" COMPOSER_REQUIRE="ezsystems/ezpublish-kernel:^6.13.6@dev"
 
 # test only master (+ Pull requests)
 branches: