Explicitly require php-xml and update vagrant box

.gitignore

@@ -1,3 +1,4 @@
 /vendor
 .vagrant/
 .idea/
+ubuntu-*.log

README.md

@@ -63,8 +63,7 @@ I'm happy about every **pull request** or **issue** you find and open to help
 making this API **more awesome**.
 
 You can use [Vagrant](https://vagrantup.com) to kick-start your development.
-Simply run `vagrant up`, `vagrant ssh` and `cd` into `/vagrant` to start 
-developing.
+Simply run `vagrant up` and `vagrant ssh` to start a PHP VM.
 
 License
 =======

Vagrantfile

@@ -2,13 +2,14 @@
 # vi: set ft=ruby :
 
 Vagrant.configure(2) do |config|
-  config.vm.box = "ubuntu/trusty64"
+  config.vm.box = "ubuntu/xenial64"
 
   config.vm.provision "shell", inline: <<-SHELL
-    sudo apt-get update
-    sudo apt-get install -y php5-cli php5-curl
+    apt-get -y -qq update
+    apt-get -y -qq install php-cli php-curl php-xml php-xdebug
 
-    sudo curl --silent https://getcomposer.org/installer | php > /dev/null 2>&1
-    sudo mv composer.phar /usr/local/bin/composer
+    curl --silent https://getcomposer.org/installer | php > /dev/null 2>&1
+    mv composer.phar /usr/local/bin/composer
+    echo "cd /vagrant" >> /home/ubuntu/.bashrc
   SHELL
 end

composer.json

@@ -17,7 +17,8 @@
         "source": "https://github.com/cmfcmf/OpenWeatherMap-PHP-Api.git"
     },
     "require": {
-        "php": ">=5.3.0"
+        "php": ">=5.3.0",
+        "ext-xml": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8 || ^5.0.5"