Update dependencies

Author: hannobraun

Cargo.toml

@@ -15,9 +15,9 @@ keywords    = ["stepper", "motor", "driver", "abstract", "interface"]
 categories  = ["embedded", "hardware-support", "no-std", "science::robotics"]
 
 [dependencies]
-embedded-hal  = "=1.0.0-alpha.2"
+embedded-hal  = "=1.0.0-alpha.4"
 embedded-time = "0.10.0"
-paste         = "1.0.2"
+paste         = "1.0.3"
 
 [features]
 default = ["drv8825", "stspin220"]