documentation: mention Perl and Swift in readme

pmd · Apr 23, 2016 · 975d276 · 975d276
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 PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks,
 unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex, XML, XSL.
 Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in
-Java, C, C++, C#, PHP, Ruby, Fortran, JavaScript, Salesforce.com Apex.
+Java, C, C++, C#, PHP, Ruby, Fortran, JavaScript, Salesforce.com Apex, Perl, Swift.
 
 ## Source