updated to match svd2rust 0.11.2

Cargo.toml

@@ -9,5 +9,13 @@ name = "stm32f40x"
 version = "0.1.0"
 
 [dependencies]
-cortex-m = "0.2.0"
+cortex-m = "0.3.0"
+bare-metal = "0.1.0"
 vcell = "0.1.0"
+
+[dependencies.cortex-m-rt]
+optional = true
+version = "0.3.0"
+
+[features]
+rt = ["cortex-m-rt"]