[FEATURE REQUEST] fastly objectstore get should return the value directly

[acme]

Is your feature request related to a problem? Please describe.

Currently fastly objectstore get returns both the key and the value:

fastly objectstore get --id $OBJECTSTOREID --key "hello"
Key: hello
Value: "there"

Describe the solution you'd like

I would like it to return just the value so that it can be scripted in a shell pipeline:

fastly objectstore get --id $OBJECTSTOREID --key "hello"
there

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[fgsch]

This should be solved once #792 lands.

[fgsch]

Fixed in d4bba2c