Update README.rst

Merge pull request #1933 from kgeorgiev93/pr.tf

Add 'tf' package

Merge pull request #1932 from kgeorgiev93/pr.tf2

Add 'tf2' package

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Merge pull request #1929 from Bjoe/pr.pegtl

Update pegtl package to version 2.8.1

Merge pull request #1928 from kgeorgiev93/pr.angles

Add 'angles' package

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Merge pull request #1924 from tastytea/pr.libxdg-basedir

Add 'libxdg-basedir' package

Add 'botan' package