Remove Symfony 3.0 tests as this is no longer supported

Author: wouterj

.travis.yml

@@ -14,23 +14,19 @@ cache:
 
 env:
   matrix:
-    - SYMFONY_VERSION=3.1.*
+    - SYMFONY_VERSION=3.2.*
   global:
     - SYMFONY_DEPRECATIONS_HELPER=231
-    - SYMFONY_PHPUNIT_REMOVE="symfony/yaml"
-    - SYMFONY_PHPUNIT_DIR="./.phpunit"
-    - SYMFONY_PHPUNIT_VERSION=5.7
+    - SYMFONY_PHPUNIT_REMOVE="symfony/yaml" SYMFONY_PHPUNIT_DIR="./.phpunit" SYMFONY_PHPUNIT_VERSION=5.7
 
 matrix:
   include:
-    - php: 7.0
+    - php: 7.1
       env: DEPS=dev SYMFONY_VERSION=3.3.*
     - php: 5.6
       env: COMPOSER_FLAGS="--prefer-lowest" SYMFONY_DEPRECATIONS_HELPER=weak
-    - php: 7.0
-      env: SYMFONY_VERSION=3.0.*
-    - php: 7.0
-      env: SYMFONY_VERSION=3.2.*
+    - php: 7.1
+      env: SYMFONY_VERSION=3.1.*
   fast_finish: true
 
 before_install:
@@ -48,4 +44,3 @@ script: vendor/bin/simple-phpunit
 
 notifications:
   irc: "irc.freenode.org#symfony-cmf"
-  email: "[email protected]"