Update README

PCBs/FlipperZero/WiFi-Devboard-Pro/README.md

@@ -2,6 +2,7 @@
 
 - Header Pin x8: [C2883805](https://www.lcsc.com/product-detail/Pin-Headers_XKB-Connectivity-X6511WVS-08H-C60D48R1_C2883805.html)
 - Header Pin x10: [C2883807](https://www.lcsc.com/product-detail/Pin-Headers_XKB-Connectivity-X6511WVS-10H-C60D48R1_C2883807.html)
+- Alternative Header: [M20-8771246](https://www.mouser.com/ProductDetail/Harwin/M20-8771246?qs=WS5Jv%252B%252Bx1qWzrNY%252Bb2U9JQ%3D%3D&countryCode=US&currencyCode=USD)
 - Light Pipe: [PLP2-188](https://www.digikey.com/en/products/detail/bivar-inc/PLP2-188/5721973?utm_medium=email&utm_source=oce&utm_campaign=4251_OCE23RT&utm_content=productdetail_US&utm_cid=2955578&so=79456987&mkt_tok=MDI4LVNYSy01MDcAAAGJOBaFWa7m6RHsJZT6mWcYRd9LRyXmqis92EV7j5ftyM5NuNOSOPqUp292m0P5E3FKrEWCFuvb9fObSzuSvVMsopuOMPjO46ylCAR1IzCL)
 - M2x6mm Round Top Screw: [97763A407](https://www.mcmaster.com/97763A407/)
 - M2x8mm Countersunk Screw: [91294A005](https://www.mcmaster.com/91294A005/)