Git confusion. Save receiver test.

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--- a/README.md
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@@ -147,6 +147,15 @@ Method:
  it will be called if an error occurs. The value corresponds to the error code
  (see below).
 
  it will be called if an error occurs. The value corresponds to the error code
  (see below).
 

+A function is provided to print errors in human readable form. This may be
+invoked as follows:
+
+```python
+from ir_rx.print_error import print_error  # Optional print of error codes
+# Assume ir is an instance of an IR receiver class
+ir.error_function(print_error)
+```
+

 #### NEC classes
 
 `NEC_8`, `NEC_16`
 #### NEC classes
 
 `NEC_8`, `NEC_16`