v_eval 0.5.2

Expression evaluator with context
Documentation
# CHANGES
## [0.5.0] 2020-27-04
## Added
- Option and dynamic type check

## Refactor
- Use Option by default
- Ever unwrap value

## [0.4.0] 2020-27-04
## Added
- `f64` methods

## [0.3.0] 2020-04-20
### Refactor
- Bump syn and quote to impersonate version

## [0.2.0] 2019-12-13
### Added
- Add Str, Range, Vec<Value> Values 

## [0.1.0] 2019-09-08
### Updated
- Bump syn and quote version to `1.0`

## [0.0.2] 2019-03-18
### Fixed

- Fix operation preference on variable 
- Document and prettify

## [0.0.1] 2019-03-18

### First release