Bump the semantic-source version + update changelog.

Merge pull request github#426 from github/semantic-source-0.0.1.0

semantic-source 0.0.1.0

Merge pull request github#307 from github/semantic-source-ghc-8.8.1

semantic-source-0.0.0.1/ghc-8.8.1

Merge pull request github#269 from github/semantic-source

Factor source code-related facilities into a new package

Merge pull request github#230 from github/lingo

Switch over to using lingo for language detection

Merge pull request github#213 from github/git-ls-tree-fixes

Git ls tree fixes

Merge pull request github#213 from github/git-ls-tree-fixes

Git ls tree fixes

Merge pull request github#179 from github/add-php

Fix PHP assignment parsing

Merge pull request github#179 from github/add-php

Fix PHP assignment parsing

Merge pull request github#106 from github/update-development-docs

Update development docs with information about Nix-style builds.