Bump Service Catalog release to 0.3.0-beta.2

[mszostok]

Release notes:

🚨Service Catalog v0.3.0-beta.2 is now available!

To install the Service Catalog from this release, run:

helm install svc-cat/catalog \
    --name catalog --namespace catalog --version 0.3.0-beta.2

In this third beta release for the Service Catalog 0.3.0 milestone, we have worked on the following:

• Fix the problem when the (Cluster)ServiceBroker name longer than 63 characters was not accepted.
• Fix the problem when the (Cluster)ServicePlan name with "_" at the beginning was not accepted.
• Update Deployments in Helm chart to support Kubernetes 1.16.x. More info here.
• Add retries to migration process in the case of restoring Service Catalog objects.

Check beta.0 and beta.1 for more release notes.

We'd really appreciate any feedback on the upgrade procedure and any issues or tips you may run into.

Changes since beta.1

Node selector is a dict (#2733)
Changing Class and Plans labels to sha224 (#2741)
fix golint errors (#2737)
Fix ServiceInstance restore process in migration job (#2735)
cleanup codebase and run gofmt (#2729)
Improve data migration process (restore crds) (#2730)
Improve travis build - skip redundant jobs (#2731)
Change Deployment api to apps/v1 (#2728)
Dump cluster info in case of failed migration and e2e tests (#2723)

SVCat Binaries

macOS: https://download.svcat.sh/cli/v0.3.0-beta.2/darwin/amd64/svcat
Windows: https://download.svcat.sh/cli/v0.3.0-beta.2/windows/amd64/svcat.exe
Linux: https://download.svcat.sh/cli/v0.3.0-beta.2/linux/amd64/svcat

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