bump as_slice

Cargo.toml

@@ -23,7 +23,7 @@ cortex-m = "0.6.0"
 nb = "0.1.2"
 cortex-m-rt = "0.6.8"
 stm32f1 = "0.8.0"
-as-slice = "0.1"
+as-slice = "0.2"
 
 [dependencies.void]
 default-features = false