fixup! Add gpio erased example

Sh3Rm4n · Sh3Rm4n · commit f1d69170fb52 · 2020-12-09T08:54:21.000+01:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -138,4 +138,4 @@ required-features = ["stm32f303xc"]
 
 [[example]]
 name = "gpio_erased"
-required-features = ["rt", "stm32f303"]
+required-features = ["rt", "stm32f303xc"]
