Jump System v1.3

Updated README.md

Jump System v1.2

Added changes for v1.2

- Fixed the initial jump being counted as a midair dash.
- Fixed several convars not having the "FCVAR_NOTIFY" flag.
- The forward jump boost now only applies to the bunnyhop feature.
- Added the "l4d_jump_system_forward_jumpboost" convar.
- Updated config file.

Jump System v1.1

Updated CHANGELOG.md

Jump System v1.0

Closed gamedata handle