Fixed incorrect comment type in properties file

[shestee]

There is wrong comment type used in version.properties (*.properties files use '#' for comments, not '//'). This PR fixes it with the right one.

[codecov-io]

Codecov Report

Merging #2107 (8d6b79b) into release/3.x (f8d0f1b) will increase coverage by 0.15%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/3.x    #2107      +/-   ##
=================================================
+ Coverage          84.74%   84.89%   +0.15%     
- Complexity          2717     2720       +3     
=================================================
  Files                325      325              
  Lines               8277     8277              
  Branches             989      989              
=================================================
+ Hits                7014     7027      +13     
+ Misses               992      981      -11     
+ Partials             271      269       -2     

Impacted Files	Coverage Δ	Complexity Δ
...l/creation/bytebuddy/InlineByteBuddyMockMaker.java	70.31% <0.00%> (+2.88%)	51.00% <0.00%> (+3.00%)
...rnal/util/reflection/ReflectionMemberAccessor.java	75.00% <0.00%> (+8.33%)	8.00% <0.00%> (ø%)

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