Fix link with parameter not working with jmeter-plugins-manager

[ubikloadpack]

Hello @undera ,
Our url had a parameter in the end "?c=1584900487" , it seems it does not work with plugins manager, the file written is ubik-jmeter-videostreaming-plugin-6.6.0.jar?c=1584900487 instead of ubik-jmeter-videostreaming-plugin-6.6.0.jar

So this PR removes this parameter.
We will try to provide a fix.

Regards

[codecov]

Codecov Report

Merging #374 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #374   +/-   ##
=========================================
  Coverage     69.36%   69.36%           
  Complexity     2571     2571           
=========================================
  Files           230      230           
  Lines         15457    15457           
  Branches       1567     1567           
=========================================
  Hits          10722    10722           
  Misses         3967     3967           
  Partials        768      768           

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