Latest development release
add caching for bitcoin prices
add unit conversions.
add bitcoin quotes via unit conversions.
allow Bitcoin Unicode characters (Ƀ and ș) in units.
rename eng to si.
add new eng that uses exponential notation with exponent constrained to be a multiple of 3.
drop support for Python 2.
make more extensive use of Unicode.
mag and ph now consume x register rather than duplicate it.
loosen regular expression that matches numbers to allow scale factor to be optional.
allow typical Unicode characters in (°, Å, Ω, Ʊ, Ω, and ℧) in units.
add support for comments.