Bump to SF 4.4 & PHPUnit version 8

.travis.yml

@@ -33,7 +33,7 @@ env:
     - SYMFONY_DEPRECATIONS_HELPER=max[self]=0
     - TARGET=test
     - UPSTREAM_URL=https://github.com/sonata-project/SonataIntlBundle.git
-    - PHPUNIT_VERSION=7
+    - PHPUNIT_VERSION=8
 
 matrix:
   fast_finish: true
@@ -45,16 +45,16 @@ matrix:
     - php: '7.2'
       env: COMPOSER_FLAGS="--prefer-lowest"
     - php: '7.3'
-      env: SYMFONY=3.4.*
+      env: SYMFONY=4.4.*
     - php: '7.3'
-      env: SYMFONY='dev-master as 3.4.x-dev'
+      env: SYMFONY='dev-master as 4.4.x-dev'
     - php: '7.3'
       env: SYMFONY_DEPRECATIONS_HELPER=0
   allow_failures:
-    - php: 7.4snapshot
+    - php: 7.4
     - php: nightly
     - env: SYMFONY_DEPRECATIONS_HELPER=0
-    - env: SYMFONY='dev-master as 3.4.x-dev'
+    - env: SYMFONY='dev-master as 4.4.x-dev'
 
 before_install:
   - git remote add upstream ${UPSTREAM_URL} && git fetch --all

composer.json

@@ -23,22 +23,22 @@
     ],
     "require": {
         "php": "^7.1",
-        "symfony/config": "^3.4 || ^4.2",
-        "symfony/dependency-injection": "^3.4 || ^4.2",
-        "symfony/http-foundation": "^3.4 || ^4.2",
-        "symfony/http-kernel": "^3.4 || ^4.2",
-        "symfony/intl": "^3.4 || ^4.2",
-        "symfony/templating": "^3.4 || ^4.2",
+        "symfony/config": "^4.4",
+        "symfony/dependency-injection": "^4.4",
+        "symfony/http-foundation": "^4.4",
+        "symfony/http-kernel": "^4.4",
+        "symfony/intl": "^4.4",
+        "symfony/templating": "^4.4",
         "twig/twig": "^2.9"
     },
     "conflict": {
         "sonata-project/user-bundle": "<2.0 || >=5.0"
     },
     "require-dev": {
-        "matthiasnoback/symfony-dependency-injection-test": "^3.1",
+        "matthiasnoback/symfony-dependency-injection-test": "^4.0",
         "sonata-project/user-bundle": "^3.6 || ^4.0",
         "symfony/phpunit-bridge": "^5.0",
-        "symfony/security-core": "^3.4 || ^4.2"
+        "symfony/security-core": "^4.4"
     },
     "suggest": {
         "sonata-project/user-bundle": "For user timezone detection"