BLD: bump version to 1.5.8

Author: luca-s

apps/scrtdd/rtdd.h

@@ -61,7 +61,7 @@ class RTDD : public Application
   };
   DEFINE_SMARTPOINTER(Region);
 
-  virtual const char *version() { return "1.5.7+"; }
+  virtual const char *version() { return "1.5.8"; }
 
 protected:
   void createCommandLineDescription();