Print the current dubbo version number

[baymax55]

Fixes #720

[codecov]

Codecov Report

Base: 27.83% // Head: 27.83% // No change to project coverage 👍

Coverage data is based on head (40ec9a2) compared to base (305a2ed).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1018   +/-   ##
==========================================
  Coverage      27.83%   27.83%           
  Complexity       687      687           
==========================================
  Files            241      241           
  Lines           5666     5666           
  Branches         513      513           
==========================================
  Hits            1577     1577           
  Misses          3943     3943           
  Partials         146      146           

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