fix: CMake build errors on Mac resolved

 - closes griffithlab#176, CMake was including `src/utils/bedtools/gzstream/version`
   as a C++ source file, when it was a simple text file containing version info
 - I moved this version info into `src/utils/bedtools/gzstream/README`

Author: TimD1

src/utils/bedtools/gzstream/README

@@ -4,3 +4,5 @@
 ===========================================================================
 
     See index.html for documentation and installation instructions.
+
+Version 1.5 (08 Jan 2003)