Test on php 7.3

Author: Nyholm

.travis.yml

@@ -12,6 +12,8 @@ php:
     - 5.6
     - 7.0
     - 7.1
+    - 7.2
+    - 7.3
 
 env:
     global:
@@ -30,10 +32,9 @@ matrix:
 before_install:
     - if [[ $COVERAGE != true ]]; then phpenv config-rm xdebug.ini || true; fi
     - if [[ "${TRAVIS_PHP_VERSION}" == "5.4" ]]; then composer remove slim/slim --dev --no-update; fi
-    - travis_retry composer self-update
 
 install:
-    - travis_retry composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
+    - composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
 
 script:
     - $TEST_COMMAND