Update the docs to recommend powering the MCP from regulated 3.3V

Turns out the USB power from the board is unregulated, and causes stability
issues with the MCP when actively using Bluetooth.

More details:
https://racechrono.com/forum/discussion/comment/10996/#Comment_10996

README.md

@@ -40,8 +40,8 @@ Recommended parts list:
 * ~22 AWG wires
 
 First, solder the male headers to your microcontroller board.
-You'll need G, USB, SCK, MO, MI and 7.
-It's also recommended to solder 9, R and 3V for future improvements and
+You'll need G, 3V, SCK, MO, MI and 7.
+It's also recommended to solder 9, R and USB for future improvements and
 mechanical stability on the breadboard.
 Soldering male headers is a lot easier if you first insert them into a
 breadboard.
@@ -73,7 +73,7 @@ Check connections:
 
 MCP pin | Microcontroller pin
 ------- | ------------------
-VCC | USB
+VCC | 3V
 GND | G
 CS | 7
 SO | MI

RaceChronoDiyBleDevice.ino

@@ -120,19 +120,18 @@ public:
     void *entry = pidMap.getEntryId(pid);
     if (entry != nullptr) {
       PidExtra *pidExtra = pidMap.getExtra(entry);
+      pidExtra->skippedUpdates = 0;
+
       switch (pid) {
       case 0xD0:
       case 0xD1:
         pidExtra->updateRateDivider = 2;
-        pidExtra->skippedUpdates = 0;
         break;
       case 0x140:
         pidExtra->updateRateDivider = 4;
-        pidExtra->skippedUpdates = 0;
         break;
        case 0x360:
         pidExtra->updateRateDivider = 20;
-        pidExtra->skippedUpdates = 0;
         break;
       }
     }