[whatwg/encoding] Meta: retry HTML checker by curl, suppress warnings (#109)

This restores 9ce8d47 but refines such that if curl hits a timeout, it
will automatically retry each request up to 7 times.

>From the curl(1) man page:

> --retry <num>
>    If  a  transient  error is returned when curl tries to perform a
>    transfer, it will retry this number of times before  giving  up.
>    Setting  the  number to 0 makes curl do no retries (which is the
>    default). Transient error means either: a timeout,  an  FTP  4xx
>    response code or an HTTP 5xx response code.
>
>    When  curl  is about to retry a transfer, it will first wait one
>    second and then for all forthcoming retries it will  double  the
>    waiting  time until it reaches 10 minutes which then will be the
>    delay between the rest of the retries.

Addresses #97
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/109

-- Commit Summary --

  * Meta: retry HTML checker by curl, suppress warnings

-- File Changes --

    M .travis.yml (11)
    M deploy.sh (10)

-- Patch Links --

https://github.com/whatwg/encoding/pull/109.patch
https://github.com/whatwg/encoding/pull/109.diff

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