lcov badge generator

Most solutions use a 3rd party service to implement badges on their github page.
This solutions generates the badge locally.

This does not utilize shields.io, and does not write to the readme file, however you only need to update the readme once since the file is generated locally, it will always reference the generated file.

Usage

$3

#### Path to report
lcov-badge-generator ./lcov.info

$3

#### Output path
lcov-badge-generator -o ./coverage/badge-name.svg

defaults to ./badge.svg

#### Label
lcov-badge-generator -l code coverage

defaults to coverage

#### npm script
"coverage": "lcov-badge-generator -o ./badges/coverage.svg ./coverage/lcov.info

Yet to come
- Configure percentage thresholds