Update the dependencies

See merge request !26

[feature]: remember last result as `ans`

See merge request redox-os/calc!24

Fix lone zero handling

Closes #26

See merge request !23

Update decimal crate to allow building for AArch64

See merge request !22

Changed the gitlab CI to match the travis CI

See merge request !20

Add support for the dice operator.

See merge request !21

The dice operator is mostly known from boardgames.

Example:
1d6  => Throw a six-sided die once
3d10 => Throw a ten-sided die thrice

Fixed issue #24

Closes #24

See merge request !19

To reduce code size, we track the format of the integral value
separately, and then "merge" the formats whenever we construct a new
value.

Work left:
- Needs to pass borrow checker (copys and such to do)
- Need to figure out what to do for `into_float`, currently stubbed out

Also forgot to format whoopsies