Problem: trailing whitespace

Solution: remove it

src/options.hpp

@@ -99,7 +99,7 @@ struct options_t
     //  Minimum interval between attempts to reconnect, in milliseconds.
     //  Default 100ms
     int reconnect_ivl;
-    
+
     //  Maximum interval between attempts to reconnect, in milliseconds.
     //  Default 0ms (meaning maximum interval is disabled)
     int reconnect_ivl_max;