readme: document v0.12.0 and the ceph versions it supports
Also, change the hint regarding build tags to use "pacific" as it
a fully supported ceph version.
@@ -50,16 +50,17 @@ work with non-current versions of Ceph, it is required to pass build-tags to
the `go` command line. A tag with the named Ceph release will enable/disable
certain features of the go-ceph packages, and prevent warnings or compile
problems. For example, to ensure you select the library features that match
-the "nautilus" release, use:
+the "pacific" release, use:
```sh
-go build -tags nautilus ....
-go test -tags nautilus ....
+go build -tags pacific ....
+go test -tags pacific ....
```
### Supported Ceph Versions
| go-ceph version | Supported Ceph Versions | Deprecated Ceph Versions |
| --------------- | ------------------------| -------------------------|
+| v0.12.0 | octopus, pacific | nautilus |
| v0.11.0 | nautilus, octopus, pacific | |
| v0.10.0 | nautilus, octopus, pacific | |
| v0.9.0 | nautilus, octopus | |
