v0.16.0

High upgrade priority due to new types:

• Polkadot: 23
• Kusama: 2023
• Westend: 43

API noteworthy:

• Support for new types (#247, #252)
• Add at field to /runtime/spec (#245)
• Implement /runtime/metadata (#242)
• Implement /blocks (#250, #247, #251) N.B. While the URI will likely not break between now and v1.0.0, it is likely there may be breaking changes to the response. Note: this is different than the /block endpoint (no s), which is still available.

Internal updates:

• Prepare v0 endpoints for deprecation. We will announce an official time line for when we will cease support soon, but for now it is ok to continue use. (#241)
• Deprecate ensureMeta (#247)