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Update roadmap.md (#4842)

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# Roadmap
## Q1 2019
- JOIN syntax compatible with SQL standard:
- Mutliple `JOIN`s in single `SELECT`
- Protobuf and Parquet input and output formats
- Import/export from HDFS and S3
- Lower metadata size in ZooKeeper
- Adaptive index granularity for MergeTree engine family
## Q2 2019
- DDL for dictionaries
- Integration with S3-like object stores
- Multiple storages for hot/cold data, JBOD support
## Q3 2019
- JOIN execution improvements:
- Distributed join not limited by memory
- Resource pools for more precise distribution of cluster capacity between users
## Q3 2019
- Fine-grained authorization
- Integration with external authentication services