Deprecate v1 parsing protocol

[dennwc]

This PR will track a deprecation of v1 parsing protocol.

Note, that gRPC v1 protocol is still used to get a list of all languages and driver version info.

Support in clients:

• [x] Go (https://github.com/bblfsh/go-client/pull/86)
• [x] Python (https://github.com/bblfsh/client-python/pull/128)
• [x] Scala (https://github.com/bblfsh/client-scala/pull/76)

Signed-off-by: Denys Smirnov [email protected]

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This change is 

[bzz]

Quick question - as this is incompatible API changes would this, according to SemVer, mean that after this is merged we are going to release bblfshd v3.0.0 ?

That would follow the logic and match the behavior of client-go.v3 version.

[kuba--]

Closing for now