Update Alfred-Workflow

Update dependencies.

Add exchange rate from ExchangeRate-API.com

• APP_KEY for OpenExchangeRates.org no longer required for (basic) currency conversion. Closes #47

Add pkg_resources to distribution

Pint requires pkg_resources but doesn't declare setuptools as a dependency.

Properly quote arguments

Fixes #53

Alfred 4 support

v3.6.0

Swap ⌘C and ↩ to match Alfred's behaviour

Swap copy behaviour of v3.5.2 to match Alfred's built-in calculator.

↩ copies the result without thousands separator, and ⌘C copies the result with the separator.

Copy result with or without thousands separator

• ↩ copies result with thousands separator
• ⌘C copies result without thousands separator #50

Add override for decimal places in currency conversion

CURRENCY_DECIMAL_PLACES overrides DECIMAL_PLACES for currencies #38

Dynamically increase decimal places until displayed result is non-zero

Add DYNAMIC_DECIMALS option. If turned on, the number of decimal places in the displayed result is increased (beyond the default DECIMAL_PLACES) until the displayed result is non-zero #38

Handle negative numbers

Fix #36