meeting: Bump July meeting from the 4th to the 11th

Catching up with:

On Thu, Jun 28, 2018 at 11:37:02AM -0500, Chris Aniszczyk wrote [1]:
> Due to holidays in the US, we will be moving the OCI dev meeting
> ahead a week.

I've used RDATE [2] to add the new date and EXDATE [3] to remove the
old date.  The ICS was validated with [4].

[1]: https://groups.google.com/a/opencontainers.org/d/msg/dev/FzclHQsMH_c/QKJMybRkBAAJ
     Subject: FYI: Moving OCI meeting a week ahead (July 4th to July 11th)
     Date: Thu, 28 Jun 2018 11:37:02 -0500
     Message-ID: <CAJg1wMQVeW70B4r95EEm+bL2ALt1u6+gk3cn_4nYy1kiUgRs8A@mail.gmail.com>
[2]: https://tools.ietf.org/html/rfc5545#section-3.8.5.2
[3]: https://tools.ietf.org/html/rfc5545#section-3.8.5.1
[4]: https://icalendar.org/validator.html

Signed-off-by: W. Trevor King <wking@tremily.us>

meeting.ics

@@ -21,11 +21,13 @@ END:DAYLIGHT
 END:VTIMEZONE
 BEGIN:VEVENT
 UID:tdc-meeting@opencontainers.org
-DTSTAMP:20171207T173000Z
+DTSTAMP:20180628T170000Z
 DTSTART;TZID=America/Los_Angeles:20170906T140000
 RRULE:FREQ=MONTHLY;INTERVAL=1;BYDAY=1WE
 RDATE;TZID=America/Los_Angeles:20180110T140000
 EXDATE;TZIP=America/Los_Angeles:20180103T140000
+RDATE;TZID=America/Los_Angeles:20180711T140000
+EXDATE;TZIP=America/Los_Angeles:20180704T140000
 DURATION:PT1H
 SUMMARY:OCI TDC Meeting
 DESCRIPTION;ALTREP="https://github.com/opencontainers/runtime-spec#