docs: update platformio.ini for version v2.0.8

Author: ManuelW77

platformio.ini

@@ -9,7 +9,7 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [common]
-version = "2.0.7"
+version = "2.0.8"
 to_old_version = "1.5.10"
 
 ##