chore: modify .env.example file

Author: perisicnikola37

phpunit.xml

@@ -8,7 +8,8 @@
       <directory suffix="Test.php">./tests/Feature</directory>
     </testsuite>
   </testsuites>
-    <env name="APP_ENV" value="testing" />
+  <php>
+    <env name="APP_ENV" value="testing"/>
     <env name="BCRYPT_ROUNDS" value="4"/>
     <env name="CACHE_DRIVER" value="array"/>
     <env name="DB_CONNECTION" value="sqlite"/>
@@ -17,6 +18,7 @@
     <env name="QUEUE_CONNECTION" value="sync"/>
     <env name="SESSION_DRIVER" value="array"/>
     <env name="TELESCOPE_ENABLED" value="false"/>
+  </php>
   <source>
     <include>
       <directory suffix=".php">./app</directory>