Version 0.2.3

• Added From<&EcoString> for EcoString (thanks to @idlercloud)
• Added TryFrom<EcoVec<T>> for [T; N] (thanks to @kaikalii)
• EcoString capacity now grows by 2x instead of +1 when spilling (16 -> 32 instead of 16 -> 17). When already spilled it already did 2x growth before.