v0.7.0 Serialization!

Allows the CMUDict struct to be serialized and deserialized for things like smaller files and executable embedding

v0.6.0 API Upgrade

now you can get all pronunciations for each word

v0.4.1 Upgrade Complete

The major changes are:

• switched from the depreciated failure crate to thiserror based errors
• switched to rust 2018 in the cargo config
• removed the utility function to download
• removed a lot of dependencies that were either no longer needed or depreciated
• fixed hung lookup bug (due to the new internals (I still don't know what caused it))
• changed the internals so file i/o wasn't needed for every lookup (and as a result simplified them)
• merged cmudict_core and cmudict into one crate (I didn't see why they were separate)