releases/index.yml missing format

[gaos1]

if you take a look at other release file, e.g.
https://github.com/logsearch/logsearch-boshrelease/blob/develop/releases/index.yml

there is a format-version line as shown below:
format-version: '2'

this is small problem and it breaks our scripts.

[mrdavidlaing]

@dpb587 - I'm going to take a guess here that the bosh_cli on your laptop is out of date?

@gaos1 What version of bosh_cli do you guys use?

[gaos1]

○ → bosh version
BOSH 1.3012.0

[dpb587]

format-version is a newer field, and since we haven't needed to create a new release in a long time, the metadata hasn't been touched since.

@gaos1, I added format-version in 3a491f1 - is that sufficient?