Add new GITHUB_TOKEN and only cache composer cache files, add PHP 7.2…

… build

.travis.yml

@@ -11,13 +11,13 @@ matrix:
   - php: nightly
 before_install:
 - phpenv config-rm xdebug.ini || true
-- composer config --global github-oauth.github.com $GITHUB_TOKEN
+- "[[ $GITHUB_TOKEN ]] && composer config --global github-oauth.github.com $GITHUB_TOKEN"
 install: composer install --no-interaction
 script: make ci
 after_script: bash <(curl -s https://codecov.io/bash)
 env:
   global:
-    secure: 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
+    secure: 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
 cache:
   directories:
-  - $HOME/.composer
+  - "$HOME/.composer/cache/files"