Fix typo in Hardware end()

STM32F1/libraries/Wire/HardWire.cpp

@@ -76,7 +76,7 @@ void HardWire::begin(uint8 self_addr) {
     i2c_master_enable(sel_hard, dev_flags);
 }
 
-void HardWire:end() {
+void HardWire::end() {
     i2c_disable(sel_hard);
     sel_hard = 0;
 }