Update INSTALL.md to include accurate security info

[sidheart]

Issue #, if available: N/A

Description of changes:
Update INSTALL.md to include accurate security info

Tests: N/A

Code coverage percentage for this patch: N/A

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #261 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #261      +/-   ##
============================================
+ Coverage     66.07%   66.12%   +0.04%     
  Complexity     1753     1753              
============================================
  Files           262      262              
  Lines         11813    11813              
  Branches        948      948              
============================================
+ Hits           7806     7811       +5     
+ Misses         3698     3693       -5     
  Partials        309      309              

Impacted Files	Coverage Δ	Complexity Δ
...csearch/performanceanalyzer/rca/RcaController.java	82.50% <0.00%> (+1.87%)	34.00% <0.00%> (ø%)
...erformanceanalyzer/rca/framework/core/RcaConf.java	79.59% <0.00%> (+4.08%)	20.00% <0.00%> (ø%)

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