cortex-m: update to volatile-register 0.2.2, fixes rust-embedded#485

Author: adamgreig

cortex-m/Cargo.toml

@@ -13,19 +13,19 @@ readme = "README.md"
 repository = "https://github.com/rust-embedded/cortex-m"
 version = "0.7.7"
 edition = "2018"
-links = "cortex-m"  # prevent multiple versions of this crate to be linked together
+links = "cortex-m" # prevent multiple versions of this crate to be linked together
 rust-version = "1.61"
 
 [dependencies]
 bare-metal = { version = "0.2.4", features = ["const-fn"] }
 critical-section = { version = "1.0.0", optional = true }
-volatile-register = "0.2.0"
+volatile-register = "0.2.2"
 bitfield = "0.13.2"
 embedded-hal = "0.2.4"
 
 [dependencies.serde]
 version = "1"
-features = [ "derive" ]
+features = ["derive"]
 optional = true
 
 [dependencies.serde_json]
@@ -48,5 +48,5 @@ targets = [
     "thumbv7em-none-eabihf",
     "thumbv7m-none-eabi",
     "thumbv8m.base-none-eabi",
-    "thumbv8m.main-none-eabi"
+    "thumbv8m.main-none-eabi",
 ]