Version 1.2.13

• build(deps-dev): apply updates 0ba5eb0
• build(deps-dev): apply updates 5c683c7
• fix: move and fix statistic related helpers implementation d4c3e68
• test: improve statistic helpers tests 806fe29
• refactor: cleanup variables namespace 791cd51
• refactor: align statistic helpers return for empty data set 6606a6f
• refactor: cleanup statistic helpers code 637942e
• perf: optimize median computation efc4c68
• docs: add GitHub CI badge to README.md 0934374