Bastian Köcher 45938d8033 Expose information about the extrinsic in the metadata (#4774)
* Expose information about the extrinsic in the metadata

This pr exposes some information about the extrinsic used in the runtime
via metadata. The following information are exposed:

- Version of the extrinsic
- List of all signed extensions used by the extrinsic.

* Increment `spec_version`
2020-01-30 16:41:03 +01:00
S
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