update release-notes

Author: Overlord360

docs/release-notes.rst

@@ -19,7 +19,8 @@ Improvements
 
 - Sequencer logic now handles exceptions raised on sequence abort. GUI will no longer hang when a test raises an exception during a test abort. 
 - Fix bug where DSOX1202G appeared to hang both the program and scope
-- LCR Driver now supports instruments reporting as Keysight or Agilent. Newer models of the LCR meter report as Keysight, whereas older models report as Agilent. 
+- LCR Driver now supports instruments reporting as Keysight or Agilent. Newer models of the LCR meter report as Keysight, whereas older models report as Agilent.
+- Fixed a bug where the PPS would crash if it was polled too frequently.
 
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 Version 0.6.4