Tagging v0.3.0

Major changes:
* Move to Rust 2018 edition #125
* Remove dependency on boxfnonce #121
* Reworked error handling #130
* Added a higher-level AuthenticatorService that can use multiple backends #123
* Changed the C API to use the new AuthenticatorService #123
* Added a Status channel for backends #122
* Now obtaining HID report sizes from the descriptors #112
* Add authenticator USB and Firmware details to the C API #93

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "authenticator"
-version = "0.2.15"
+version = "0.3.0"
 authors = ["J.C. Jones <jc@mozilla.com>", "Tim Taubert <ttaubert@mozilla.com>", "Kyle Machulis <kyle@nonpolynomial.com>"]
 keywords = ["ctap2", "u2f", "fido", "webauthn"]
 categories = ["cryptography", "hardware-support", "os"]