Make SUBSCRIPTION bold.

Author: JiaoXianjun

README.md

@@ -3,7 +3,7 @@
 
 **openwifi:** Linux mac80211 compatible full-stack IEEE802.11/Wi-Fi design based on SDR (Software Defined Radio).
 
-- We remain committed to open source, which is our foundation. To access advanced features and dedicated support, consider a subscription. More info on https://openwifi.tech
+- We remain committed to open source, which is our foundation. To access advanced features and dedicated support, consider a **SUBSCRIPTION**. More info on https://openwifi.tech
 
 [[Introduction](#Introduction)]
 [[Build FPGA](#Build-FPGA)]