added bold-color option and updated the README

README

@@ -1,10 +1,13 @@
-usage : tty-clock [-sctrvih] [-C [0-7]] [-f format]
+usage : tty-clock [-sctrvihD] [-C [0-7]] [-f format]              
     -s            Show seconds                                   
     -c            Set the clock at the center of the terminal    
     -C [0-7]      Set the clock color                            
+    -b            Use bold colors                                
     -t            Set the hour in 12h format                     
     -r            Do rebound the clock                           
     -f format     Set the date format                            
     -v            Show tty-clock version                         
     -i            Show some info about tty-clock                 
     -h            Show this page                                 
+    -d delay      Set the delay between two redraws of the clock 
+    -D            Hide date                                      

ttyclock.h

@@ -67,6 +67,7 @@ typedef struct
           Bool date;
           char *format;
           int color;
+          Bool bold;
           long delay;
      } option;