Update the information for Heroku

[stof]

Version used were outdated, and I added the info that it supports auto-update (it selects the version based on composer constraints, so requiring ~5.5 will upgrade you to 5.6 automatically on next deployment once 5.6 is available for instance as it matches the constraint).
Note that the info about updates is not displayed currently for custom hosts, but the manual_update was already in the data so it makes sense to complete it.

[philsturgeon]

Thank you! This site is only useful when people send PRs, so you're doing a great job.

I'll automate it a bit for #82 :)

[stof]

@philsturgeon you should add a note on the website saying that this table is maintained by the community and they should contribute if they find an outdated data.

[philsturgeon]

Oh yeah, I said that on the tweets and whatnot, and figured it was probably rather clear, but I’ll put a note in the footer with a link to CONTRIBUTING.md or something.

-- 
Phil

From: Christophe Coevoet [email protected]
Reply: philsturgeon/phpversions.info [email protected]>
Date: August 26, 2015 at 11:06:55 AM
To: philsturgeon/phpversions.info [email protected]>
Cc: Phil Sturgeon [email protected]>
Subject:  Re: [phpversions.info] Update the information for Heroku (#111)

@philsturgeon you should add a note on the website saying that this table is maintained by the community and they should contribute if they find an outdated data.

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