add pem postprocessor to the rules where pem detection applies

example to add postprocessor - 
`
  - Code: 4005
    Pattern: "(?i).*\\.pem$"
    Caption: Potential cryptographic private key
    Category: key
    Example: file.pem
    SolutionID: 11
    Severity: 4
    Confidence: 2
    Postprocess: ''
`