travis ci: update conform latest guidelines

see https://github.com/zendframework/maintainers/blob/master/template/.travis.yml

Author: geerteltink

.travis.yml

@@ -5,8 +5,6 @@ language: php
 cache:
   directories:
     - $HOME/.composer/cache
-    - $HOME/.local
-    - vendor
 
 env:
   global:
@@ -22,6 +20,7 @@ matrix:
     - php: 5.6
       env:
         - DEPS=locked
+        - CS_CHECK=true
         - TEST_COVERAGE=true
     - php: 5.6
       env:
@@ -40,7 +39,6 @@ matrix:
     - php: 7
       env:
         - DEPS=locked
-        - CS_CHECK=true
     - php: 7
       env:
         - DEPS=locked
@@ -69,25 +67,25 @@ matrix:
     - php: 7.1
       env:
         - DEPS=latest
-    - php: nightly
+    - php: 7.2
       env:
         - DEPS=lowest
-    - php: nightly
+    - php: 7.2
       env:
         - DEPS=locked
-    - php: nightly
+    - php: 7.2
       env:
         - DEPS=locked
         - HELPER_DEPS="zendframework/zend-expressive-helpers:^2.2 zendframework/zend-expressive-router:^1.3.2"
-    - php: nightly
+    - php: 7.2
       env:
         - DEPS=locked
         - HELPER_DEPS="zendframework/zend-expressive-helpers:^3.0.1"
-    - php: nightly
+    - php: 7.2
       env:
         - DEPS=latest
   allow_failures:
-    - php: nightly
+    - php: 7.2
 
 before_install:
   - if [[ $TEST_COVERAGE != 'true' ]]; then phpenv config-rm xdebug.ini || return 0 ; fi