zendframework / zend-session / 231

58%

Pull #92

travis-ci

ext/mongodb installation in Travis-CI

- PHP 7+ environments have it by default, but it's out-of-date
- PHP 5 environments have ext/mongo but not ext/mongodb, so we need to
  install it.

`pecl upgrade` will install if it's not present, and upgrade otherwise.
Once installed, we need to enable it if it is not already.

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