Clarify README for windows users

On Windows add the .gitinit may not be enough.
On my case i have lost at least a few hours before i give up, for the next day i discovery that just because a restart my computer fixed all.

Author: VictorGerin

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Reexport `Direction` from `qei`
 - Add dac
 - Fix flash error flag clearing
+- Clarify README for windows users
 
 ### Added
 

README.md

@@ -102,6 +102,7 @@ working directory.
   ```batch
   echo set auto-load safe-path %CD% >> %USERPROFILE%\.gdbinit
   ```
+  *You may need restart your computer*
 
 If everything was successful, cargo should compile your project, start gdb,
 load your program and give you a prompt. If you type `continue` in the gdb
@@ -159,6 +160,7 @@ You may need to give `cargo` permission to call `gdb` from the working directory
   ```batch
   echo set auto-load safe-path %CD% >> %USERPROFILE%\.gdbinit
   ```
+  *You may need restart your computer*
 
 Compile, load, and launch the hardware debugger.
 ```bash