Html character entities adding additional backslashes

Html2text was observed adding additional backslashes before a hyphen when parsing html strings using `html2text.html2text(str)`

**Example**

String Input:
`BEAK> - Brean Down`

Expected:
`BEAK> - Brean Down `

Actual:
`BEAK> \\- Brean Down `

There was a similar case for other other character entities as well:
`BEAK≤ \\- Brean Down`

- `2020.1.16` html2text version
- `Python 3.8.3` Python version