Mark version number as develoment

Co-authored-by: Christian Meusel <[email protected]>

Author: eldruin

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sysfs-pwm"
-version = "0.1.0"
+version = "0.2.0-alpha.0"
 authors = [
     "Rust Embedded WG Linux Team <[email protected]>",
     "Paul Osborne <[email protected]>"