0.14.1 has no feature bound on alloc

[eloc3147]

Not sure how this happened, but the published 0.14.1 version of this crate has no #[cfg(feature = "alloc")] bound on the extern crate alloc import. I'm not sure which revision this is as there is no tag or release for 0.14.1.

[NULLx76]

Also unsure what happened there, I published version 0.14.2 that fixes this

[eloc3147]

Er, sorry. I probably should have checked that the current master branch of this crate compiles without the alloc feature enabled.

I made a PR (#120) to get compiling without alloc working again and a test to hopefully prevent this in future.