Move to winapi 0.3

[Lokathor]

With the new 0.3 branch of winapi, compile times are much smaller because it only builds the bindings for the portions of winapi actually used in a build. Since this crate uses only a few functions all from the same module, it would be a great benefit to move to the 0.3 series of winapi.

[eminence]

Nice! Updating from 0.2 to 0.3 reduced the build times from about 25 seconds to 5 seconds! I've just published terminal-size version v0.1.8 that depends on winapi 0.3