Update docs for 0.16.x

[ajibarra]

Fixes #2271

[MasterOdin]

Thanks!

[MichaelRushton]

@MasterOdin @ajibarra

This doesn't actually update the documentation, it only changes the displayed version number.

As an example, this code from the documentation throws a fatal error because getQueryBuilder now requires a string $type argument.

$builder = $this->getQueryBuilder();

There are also now getSelectBuilder, getInsertBuilder, getUpdateBuilder, and getDeleteBuilder methods that are undocumented.

[MasterOdin]

The docs for that hasn't been updated, and can see that in git:

phinx/docs/en/migrations.rst

Lines 1646 to 1676 in 6154850

	Using the Query Builder
	-----------------------
	It is not uncommon to pair database structure changes with data changes. For example, you may want to
	migrate the data in a couple columns from the users to a newly created table. For this type of scenarios,
	Phinx provides access to a Query builder object, that you may use to execute complex ``SELECT``, ``UPDATE``,
	``INSERT`` or ``DELETE`` statements.
	The Query builder is provided by the `cakephp/database <https://github.com/cakephp/database>`_ project, and should
	be easy to work with as it resembles very closely plain SQL. Accesing the query builder is done by calling the
	``getQueryBuilder()`` function:
	.. code-block:: php
	<?php
	use Phinx\Migration\AbstractMigration;
	class MyNewMigration extends AbstractMigration
	{
	/**
	* Migrate Up.
	*/
	public function up()
	{
	$builder = $this->getQueryBuilder();
	$statement = $builder->select('*')->from('users')->execute();
	var_dump($statement->fetchAll());
	}
	}

The docs are ideally rolling in that we only publish for the latest 0.x release, but things get missed. I'll make an issue to at least keep track of this particular issue, but please make issues for any other things you notice are out of date.