Update readme.md

Marlin/src/HAL/HAL_STM32F1/README.md

 # This HAL is for STM32F103 boards used with libmaple/stm32duino Arduino core.
 
-# This HAL is in development and has not been tested with an actual printer.
+# This HAL is in development. Currently has been tested in Malyan M200 (103CBT6), Chitu 3d (103ZET6), and custom boards(103VET6).
 
 ### The stm32 core needs a modification in the file util.h to avoid conflict with Marlin macros for Debug.
 Since only 1 file needs change in the stm32duino core, it's preferable over making changes to Marlin.
 
 ### Main developers:
 Victorpv
+xC000005
 
 
 ### Most up to date repository for this HAL:
 https://github.com/victorpv/Marlin/tree/bugfix-2.0.x
 
-PRs should be first sent to that fork, and once tested merged to Marlin bugfix-2.0.x branch.
+PRs should only be sent to Marlin bugfix-2.0.x branch once tested in printing so not to introduce new bugs.
+For testing/dev, you can submit to the above branch