Tabulate Versions Save

• https://github.com/p-ranav/tabulate/pull/58 Fix compiler warning "non-virtual-dtor"
• https://github.com/p-ranav/tabulate/pull/77 Support std::string_view
• https://github.com/p-ranav/tabulate/pull/87 Fix issue with optional include on old compilers
• https://github.com/p-ranav/tabulate/pull/88 Fixed unused parameter warning
• https://github.com/p-ranav/tabulate/pull/91 Fix Typo in CMakeLists.txt
• https://github.com/p-ranav/tabulate/pull/97 Table: Provide size() function returning row counts
• https://github.com/p-ranav/tabulate/pull/98 Improvement: Precalculate the cell content
• https://github.com/p-ranav/tabulate/pull/100 Bump version to 1.5.0 and fix clang-format configuration

• Added version file tabulate.hpp and updated CMake #52
• Added sample that shows table refresh #54

• Support for >=C++11 #43 by using optional-lite and variant-lite as fallback data structures if C++17 compiler support is unavailable.

Improved compatibility with Mac SDK 10.9 #41

• Exporters: Markdown, LaTeX and AsciiDoc
• .shape() method