Update README.txt

Partially added v1.3.0 release notes
Update modlist.txt

Partially added v1.3.0 changes
Update README.txt

v1.3.0 release notes
Update modlist.txt

v1.3.0 changes
Merge pull request #19 from VictiniX888/v1.3.0

v1.3.0 (closes #12, closes #16)