Merge pull request #199 from git-quick-stats/task/issues-3

Enhance daily statistics tracking

Merge pull request #200 from git-quick-stats/task/issues-171

Add option to list new contributors since a specified git tag

Merge pull request #197 from git-quick-stats/fix/issues-196

GNU date requirements for macOS and FreeBSD

Merge pull request #195 from tomice/issues/194-flatten-awk-arrays-for…

…-bsd-awk-compat

Flatten arrays for wider awk compatibility

Merge pull request #190 from git-quick-stats/task/commits-heatmap

commits heatmap

Update README.md

Merge pull request #187 from FloezeTv/fix/default-until-date-locale

Merge pull request #183 from git-quick-stats/feat/activity-calendar

Activity calendar by author

Merge pull request #174 from tomice/master

Update README.md

* Update README.md's screenshots to show new features added since last screenshots were taken