v0.4.0 - Upgrade to new JWT package

What's new:

https://github.com/dgrijalva/jwt-go/tags - is considered to be deprecated (and archived)
So that is why it is needed to migrate to github.com/golang-jwt/jwt

v0.3.0 - Stream interceptor

1. Added stream interceptor. See: https://github.com/LdDl/grpc-jwt/blob/master/auth_service.go#L119
2. Updated server and client examples
3. Update protobuf package
4. Updated protoc call in README

v0.2.2 - Extract claims

Added a way to extract claims from token:
8149076

It shortcuts interceptor.ParseToken(token)->grpcjwt.ExtractClaimsFromToken(token)

v0.2.1 - Parse token

Added a way to parse token from string by Interceptor method:
d10f45d

v0.2.0 - Refresh Token

1. Added RefreshToken service
2. Workaround with mocking up Database

v0.1.0 - First release

docs