test build php 7.3

Author: troosan

.travis.yml

@@ -18,9 +18,12 @@ matrix:
           env: COVERAGE=1
         - php: 5.3
           env: COMPOSER_MEMORY_LIMIT=2G
+        - php: 7.3
+          env: DEPENDENCIES="--ignore-platform-reqs"
     exclude:
-        - php: 7.0
         - php: 5.3
+        - php: 7.0
+        - php: 7.3
     allow_failures:
         - php: 7.3
 
@@ -43,7 +46,7 @@ before_script:
     - if [ -z "$COVERAGE" ]; then phpenv config-rm xdebug.ini || echo "xdebug not available" ; fi
     ## Composer
     - composer self-update
-    - travis_wait composer install --prefer-source
+    - travis_wait composer install --prefer-source $(if [ -n "$DEPENDENCIES" ]; then echo $DEPENDENCIES; fi)
     ## PHPDocumentor
     ##- mkdir -p build/docs
     - mkdir -p build/coverage