Version 0.3.0

• Added EcoString::{insert, insert_str, remove} methods
• Added EcoVec::{drain, splice} methods
• Added ToEcoString trait for conveniently converting something that implements Display to an EcoString
• Added AsRef<[u8]>, AsRef<OsStr>, and AsRef<Path> impls for EcoString (thanks to @tingerrr)
• Added FromIterator<&str> and Extend<&str> impls for EcoString (thanks to @pedrodesu)
• Optimized EcoVec::reserve in the case it is non-unique (thanks to @ndren)
• Added #[clippy::format_args] to eco_format macro so that eco_format! calls are linted by clippy (thanks to @isuffix)

This is a re-release of v0.2.7 which has been yanked. See #63 for more information.