Fix reflection

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$ php --re tarantool
Extension [ extension #168 tarantool version 1.0 ] {
...

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Please check for upset

From README.md

public array Tarantool::upsert(mixed $space, mixed $key, array $ops [, number $index] )

From Code, should be

public array Tarantool::upsert(mixed $space, array $tuple, array $args)

[bigbes]

Thank you very much, Remi. I've rebased (squashed your commits) and pushed them by hand.