Adds a -hide-private-members flag

[weters]

Added a -hide-private-members to hide private fields and methods

[jfeliu007]

Hi @weters, thanks for this PR, I have not reviewed this yet because I am having trouble running automation for this repo. Also, was this an issue in the issues section? I am trying to be consistent with how to develop for this repo to make sure everything that is worked on is relevant. This seems to be a nice feature, but could you open an issue for this and reference it here as fixed? Take a look at https://github.com/jfeliu007/goplantuml/blob/master/CONTRIBUTING.md if you have a chance. Again, thanks for contributing, I really appreciate the effort of anyone that wants to be involved.

[jfeliu007]

I am going to close this one and reopen it to run the automation. I just fixed it.

[codecov]

Codecov Report

Merging #110 (386ce1a) into master (84f20f5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #110   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          509       516    +7     
=========================================
+ Hits           509       516    +7     

Impacted Files	Coverage Δ
parser/class_parser.go	100.00% <100.00%> (ø)

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