fix mcode

Author: senzhk

README.md

@@ -80,7 +80,7 @@ adb shell am broadcast -a ADB_INPUT_CHARS --eia chars '128568,32,67,97,116'
 To send Ctrl + A as below: (4096 is META_CONTROL_ON, 8192 is META_CONTROL_LEFT_ON, 29 is KEYCODE_A)
 adb shell am broadcast -a ADB_INPUT_TEXT --es mcode '4096,29' // one metaState.
 or
-adb shell am broadcast -a ADB_INPUT_TEXT --es mcode '4096^+^8192,29' // two metaState.
+adb shell am broadcast -a ADB_INPUT_TEXT --es mcode '4096+8192,29' // two metaState.
 
 
 6. CLEAR all text (starting from v2.0)