Test enhancement

.travis.yml

@@ -1,18 +1,24 @@
 # see http://about.travis-ci.org/docs/user/languages/php/ for more hints
 language: php
-dist: precise
 
 # list any PHP version you want to test against
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+  - nightly
   - hhvm
 
 matrix:
   allow_failures:
     - php: hhvm
+    - php: nightly
+    include:
+    - php: 5.3
+      dist: precise
 
 before_script:
   - composer install

composer.json

@@ -16,11 +16,19 @@
         "php": ">=5.3.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8.35"
+        "phpunit/phpunit": "^4.8.35 || ^5.5 || ^6.5"
+    },
+    "suggest": {
+        "ext-mbstring": "It can support the multiple bytes string length."
     },
     "autoload": {
-        "psr-0": {
-            "Valitron": "src/"
+        "psr-4": {
+            "Valitron\\": "src/Valitron"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Valitron\\": "tests/Valitron"
         }
     },
     "scripts": {

phpunit.xml

@@ -15,4 +15,12 @@
       <directory suffix="Test.php">tests/Valitron</directory>
     </testsuite>
   </testsuites>
+  <filter>
+    <whitelist>
+      <directory suffix=".php">src/</directory>
+    </whitelist>
+      <blacklist>
+        <directory suffix=".php">vendor/</directory>
+      </blacklist>
+    </filter>
 </phpunit>