v0.6.3

Maintenance:

• reduce cyclomatic complexities in test/integration/main.go;
• add comments to internal functions for which it was missing;

Dependencies:

• update cloud.google.com/go/bigquery to v1.25.0 (was v1.24.0):
  • contained a breaking change in the ManagedWriter API, NoStreamOffset is no longer to be passed
    to AppendRow and instead the call is to be made without an option for our purposes (Default streams);
• update cloud.google.com/go to v0.98.0 (was v0.97.0);
• update cloud.google.com/api to v0.61.0 (was v0.60.0);
• update github.com/cncf/xds/go, golang.org/x/net, golang.org/x/sys and google.golang.org/genproto
  to latest version (no semver);

Documentation:

• Fix version code compare links in CHANGELOG.md;
• Add Awesome-Go badge to README as BQWriter is since 2021-11-17 listed in the awesome-go curated list;