STM32F070X6 devices do not have TIM6, TIM7 and TIM15

Author: jessebraham

src/timers.rs

@@ -221,14 +221,14 @@ timers! {
 #[cfg(any(
     feature = "stm32f030x8",
     feature = "stm32f030xc",
-    feature = "stm32f070",
+    feature = "stm32f070xb",
 ))]
 timers! {
     TIM6: (tim6, tim6en, tim6rst, apb1enr, apb1rstr),
     TIM15: (tim15, tim15en, tim15rst, apb2enr, apb2rstr),
 }
 
-#[cfg(any(feature = "stm32f030xc", feature = "stm32f070"))]
+#[cfg(any(feature = "stm32f030xc", feature = "stm32f070xb"))]
 timers! {
     TIM7: (tim7, tim7en, tim7rst, apb1enr, apb1rstr),
 }