FIX: Update version numbers and changelog.md

OpenBCI_32bit_Library.cpp

@@ -685,7 +685,7 @@ void OpenBCI_32bit_Library::boardReset(void) {
     printAll("On Daisy ADS1299 Device ID: 0x"); printlnHex(ADS_getDeviceID(ON_DAISY));
   }
   printAll("LIS3DH Device ID: 0x"); printlnHex(LIS3DH_getDeviceID());
-  printlnAll("Firmware: v3.0.0-rc6");
+  printlnAll("Firmware: v3.0.0-rc7");
   sendEOT();
   delay(5);
   wifi.reset();

changelog.md

@@ -59,7 +59,7 @@
 
 ### New Features
 
-* Marker mode, where you can store markers to the stream.
+* Marker mode, where you can store markers to the stream. Send a `/4` to engage this mode.
 
 ## Release Candidate 6