test: increase coverage

docs(badge): add 'lgtm' badge at README.md

chore(release): 0.3.0 version notes

docs: review README.md

feat(new-method): bet(float) -> bool

feat: number() raise exception if a > b

chore(release): 0.2.0 version notes

feat(method): random.roll('1d6')

chore(local): npm run console

docs: README.md

chore(release): 0.1.0 version notes

test: improve unit-testing

chore(ci): init semantic-release

feat: first version of RandomGenerator

npm init