fix actions

.github/workflows/build.yaml

@@ -9,6 +9,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        submodules: recursive
     
     - name: Cache PlatformIO
       uses: actions/cache@v2

README.md

@@ -53,7 +53,7 @@ A 3d-printable housing can be found here:
   - https://www.thingiverse.com/thing:4571627 (ESP32-Cam housing only)
 
 ## Build it yourself
-See [Build Instructions](code/README.md)
+See [Build Instructions](code/README.md).
 
 ## Donate
 If you would like to support the developer with a cup of coffee you can do that via [Paypal](https://www.paypal.com/donate?hosted_button_id=8TRSVYNYKDSWL).