Markdown source files: Use ... to end YAML metadata block

Also add a newline after the metadata block.

... is easier on markdown-mode; if --- is used, the line immediately
above it will be treated as a setext header and highlighted, which isn't
so easy on the eyes.

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diff --git a/source/blog/2015-10-01-upgrading-to-el-capitan.md b/source/blog/2015-10-01-upgrading-to-el-capitan.md
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 title: "Upgrading to El Capitan"
 date: 2015-10-01T11:46:44-07:00
 date_display: October 1, 2015
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 I upgraded to El Capitan last night, and the experience is pretty painless. To be accurate, I'm not really upgrading in place — I always perform a clean install for each major OS upgrade to avoid subtle breakage later on. Therefore, what I did instead was to `rsync` out all my valuable data and state information[^state] to an external drive, wipe the internal drive clean, install new OS from scratch, then `rsync` everything back in. `rsync` is really good at this stuff (I affectionately alias `rsync -avP` to `r` during transfers in and out), and it is simply amazing at dropping the right stuff at the right place, including data deep down `~/Library/Containers`, without interfering with the existing structures[^existing]. With data and state info ready, reinstalling programs is also easy, thanks to my recently finished [automated provisioning system](/blog/2015-08-25-automated-os-x-provisioning.html). It was the first time I used it outside a VM to provision an OS from almost scratch, and I'm really happy with it.
 
 Thus far, most of my programs and applications seem to work just fine on El Capitan. I needed to `brew reinstall pyenv --HEAD` because an OpenSSL fix for El Capitan hasn't made into a release yet. Some of XtraFinder's features[^rootless], including my most needed auto resizing columns, don't seem to work on El Capitan yet, and I'll have to contact the developer soon. The only distratrous incompatibility I've seen lies with Mathematica 9; `codesign -vvvv Mathematica.app` on the v9.0.1 app bundle says `resource envelope is obsolete (version 1 signature)`, and OS X downright refused to open the app, offering me no option other than trashing the app, even when I temporarily set Gatekeeper to "Any". Anyway, I quickly paid to upgrade to v10.2.0 (cost of free OS upgrade, geez), and it ran happily afterwards. Those were basically all I had to deal with. I haven't set up my mail accounts[^mail] and printer yet, but hopefully they will work, and just hopefully Apple Mail finally got it right this time™ and won't ask me to reauthenticate with Gmail all the time.