Update cortex-m version requirement to allow new 0.6.0 version
@@ -20,7 +20,7 @@ r0 = "0.2.2"
cortex-m-rt-macros = { path = "macros", version = "0.1.5" }
[dev-dependencies]
-cortex-m = "0.5.7"
+cortex-m = ">= 0.5.7, <0.7"
panic-halt = "0.2.0"
cortex-m-semihosting = "0.3.1"
