Allow build with py-prompt_toolkit 2.x
- Bump PORTREVISION for package change
Obtained from: https://github.com/jonathanslenders/http-prompt/commit/34de86178d8ae2b478e0ad989222aab24dd4c046
https://github.com/jonathanslenders/http-prompt/commit/d3d84de2aa7f3fce521e5ac63f4bbcf9a2166501
Approved by: dbaio (maintainer)