chore: upgrade redis client

[MrOrz]

chore: upgrade redis client

refactor(redisclient): share redis client connection

• and rewrite as redis client uses promise

[MrOrz]

Current dependencies on/for this PR:

• master
  • PR [1] Simplify postback handler signatures #372
    • PR [2] simplify text handlers as well #371
      • PR [3] Move selectedArticleId from context to action payload #369
        • PR Fix choosing reply action #373
          • PR chore: upgrade redis client #374 👈

This stack of pull requests is managed by Graphite.

[coveralls]

Pull Request Test Coverage Report for Build 6971896528

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.666%

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Totals
Change from base Build 6957663668:	0.0%
Covered Lines:	977
Relevant Lines:	1053

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💛 - Coveralls