Fix error in example sketch

Author: NT7S

README.md

@@ -711,6 +711,10 @@ This library does not currently support the spread spectrum function of the Si53
 Changelog
 ---------
 
+* v2.1.1
+
+    * Add bool return value to _init()_ indicating whether a device is on the I2C bus
+    
 * v2.1.0
 
     * Add support for reference frequencies and corrections for both the XO and CLKIN

examples/si5351_example/si5351_example.ino

@@ -29,7 +29,7 @@ void setup()
   // Start serial and initialize the Si5351
   Serial.begin(57600);
   i2c_found = si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0);
-  if(i2c_found)
+  if(!i2c_found)
   {
     Serial.println("Device not found on I2C bus!")
   }