0.6.4

Price improvements:

• Add more exchanges #63, b7b3a2d
• Improve parallel download() on Windows and fix progress bar #46
• Fix error Failed to map these Yahoo intervals to xcal on intraday price fetches when YFC persists in-memory between re-fetches #62
• Small internal fixes ae4ba08

Financials improvements:

• better estimation of interim earnings interval
• improve handling bad Yahoo data in earnings dates d1474ef

Shares

• Fix get_shares() when start/end=None, or Yahoo returning empty dc11d14