Removed App.Version.

[ymh199478]

Q	A
Branch?	v2.0(master)
Bug fix?	No
New feature?	No
Deprecations?	No
Internal Changed?	Yes
Removed	No
Tests pass?	Yes
Doc pr?	No

This commit removed the App.Version, Please use Application.Version directly

[codecov-io]

Codecov Report

Merging #266 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #266   +/-   ##
=======================================
  Coverage   89.44%   89.44%           
=======================================
  Files          36       36           
  Lines        2445     2445           
=======================================
  Hits         2187     2187           
  Misses        258      258

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