v0.10.3

What's Changed

• import: improve error messages by @dyc3 in #287
• replace crates hmac-sha1 and hmac-sha256 with equivalent crates from RustCrypto by @dyc3 in #288
• upgrade base64 crate to 0.21 by @dyc3 in #289
• trade: automatically retry submitting confirmations by @dyc3 in #294

Full Changelog: v0.10.2...v0.10.3