minor symfony#24112 [travis] fix minor php7.0 version (nicolas-grekas)

This PR was merged into the 3.3 branch.

Discussion
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[travis] fix minor php7.0 version

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

7.0.7 is the default on travis-trusty, but we need 7.0.8 mini...

Commits
-------

0793365 [travis] fix minor php7.0 version

Author: nicolas-grekas

.travis.yml

@@ -25,7 +25,7 @@ matrix:
           group: edge
         - php: 5.5
         - php: 5.6
-        - php: 7.0
+        - php: 7.0.8
           env: deps=high
         - php: 7.1
           env: deps=low
@@ -128,7 +128,7 @@ before_install:
 
     - |
       # Install extra PHP extensions
-      if [[ ! $skip && $PHP = 7.0 ]]; then
+      if [[ ! $skip && $PHP = 7.0.* ]]; then
           wget https://github.com/symfony/binary-utils/releases/download/v0.1/ldap-php70.tar.bz2
           tar -xjf ldap-php70.tar.bz2
           echo extension = $(pwd)/ldap.so >> $INI
@@ -197,10 +197,7 @@ install:
           elif [[ $deps = high ]]; then
               echo "$COMPONENTS" | parallel --gnu -j10% "tfold {} 'cd {} && $COMPOSER_UP && $PHPUNIT_X$LEGACY'"
           elif [[ $deps = low ]]; then
-              echo "$COMPONENTS" | parallel --gnu -j10% "tfold {} 'cd {} && $COMPOSER_UP --prefer-lowest --prefer-stable && $PHPUNIT_X'" &&
-              # Test the PhpUnit bridge on PHP 5.3, using the original phpunit script
-              tfold src/Symfony/Bridge/PhpUnit \
-              "cd src/Symfony/Bridge/PhpUnit && wget https://phar.phpunit.de/phpunit-4.8.phar && phpenv global 5.3 && composer update --no-progress --ansi && php phpunit-4.8.phar"
+              echo "$COMPONENTS" | parallel --gnu -j10% "tfold {} 'cd {} && $COMPOSER_UP --prefer-lowest --prefer-stable && $PHPUNIT_X'"
           elif [[ $PHP = hhvm* ]]; then
               $PHPUNIT --exclude-group benchmark,intl-data
           else