Compiling for aarch64-unknown-linux-gnu fails if target does not have OpenSSL installed

[zeon256]

Looks like v0.5.0 fails to compile to aarch64-unknown-linux-gnu when target does not have OpenSSL installed. Since the requirement of OpenSSL has been removed in favour of rustls, this should not happen. We can simply change Cargo.toml to disable default features for reqwest.

reqwest = { version = "0.11", features = ["json", "rustls"], default-features = false}