The type of the second parameter of Store#get should be SessionData,
not Session. It's bit confusing because parameter name "session" is
used for both Session and SessionData on their documentation.
From [the readme](https://github.com/expressjs/session#secret):
> This is the secret used to sign the session ID cookie. This can be either a string for a single secret, or an array of multiple secrets. If an array of secrets is provided, only the first element will be used to sign the session ID cookie, while all the elements will be considered when verifying the signature in requests.
* Allow typing express body, params, query and cookies through generics
* Increase minor version
* Add ts version comment
* Fix ts requirement comment typo
* Bump all ts version packages
* Bump Morgan package
