Undo accidental loss of 6.10.0 SoftwareSerial (#7714)

earlephilhower · web-flow · commit 4c7a20868aae · 2020-11-19T21:53:02.000-08:00
diff --git a/libraries/SoftwareSerial b/libraries/SoftwareSerial
@@ -1 +1 @@
-Subproject commit 4c08ee8d2cb7b5b27eb4f86797694cbac94aa5c9
+Subproject commit 6d520c259cad4457ccdbee362c16f7fa3b504b06
