README update

README.md

@@ -84,7 +84,7 @@ Vanity generation adress.
 
 #### Usage
 
-./vain privatekey.dat prefix <threads> <signature>
+./vain --usage
 
 #### Time to Generate on a 2.70GHz Processor
 | characters| time to generate (approx.) |

vanitygen.cpp

@@ -225,7 +225,7 @@ void usaging(void){
 	"--signature -s (signature type)\n"
 	"-o --output output file(default private.dat)\n"
 	"--usage usaging\n"
-	"--prefix -p\n"
+	//"--prefix -p\n"
 	"";
 	puts(help);
 }