mantra 0.6.0

`mantra` offers a lightweight approach for requirement tracing and coverage.
Documentation
# `main_id`: Main requirement ID

## `main_id.sub_id`: Sub-requirement ID


# `other_id`: Other requirement ID


# `id`: Parent ID

## `id.sub_id_1`: Sub ID 1

### `id.sub_id_1.sub_sub_id_1`(manual): Sub-sub ID 1.1

#### `id.sub_id_1.sub_sub_id_1.sub_sub_sub_id_1`: Sub-sub-sub ID 1.1.1

#### `id.sub_id_1.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 1.1.2

### `id.sub_id_1.sub_sub_id_2`(v1:deprecated): Sub-sub ID 1.2

## `id.sub_id_2`: Sub ID 2

### `id.sub_id_2.sub_sub_id_1`(deprecated): Sub-sub ID 2.1

#### `id.sub_id_2.sub_sub_id_1.sub_sub_sub_id_1`: Sub-sub-sub ID 2.1.1

#### `id.sub_id_2.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 2.1.2

### `id.sub_id_2.sub_sub_id_2`: Sub-sub ID 2.2

## `id.sub_id_3`: Sub ID 3

### `id.sub_id_3.sub_sub_id_1`: Sub-sub ID 3.1

#### `id.sub_id_3.sub_sub_id_1.sub_sub_sub_id_1`(manual): Sub-sub-sub ID 3.1.1

#### `id.sub_id_3.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 3.1.2

### `id.sub_id_3.sub_sub_id_2`: Sub-sub ID 3.2