0.7.9 September 1 2018

• Added chart_axis_set_label_align() function to set the alignment of chart
  category axis labels.

• Added lxw_version() function to get the library version.

0.7.8 August 30 2018

• Added worksheet_insert_image_buffer() function to insert images from
  memory buffers.

0.7.7 May 16 2018

• Fix to ensure the use of wide filenames on Windows with Microsoft Visual C++.

• Added docs on building an app with Cmake and Microsoft Visual C++ on Windows.

0.7.6 January 11 2018

• Added support for worksheet Grouping and Outlines.

• Fix include of libxlsxwriter as a CocoaPod on macOS.

0.7.5 September 25 2017

• Added support for data validations and dropdown lists.

0.7.4 August 20 2017

• Fix make build system "install" target for compatibility with MacOS "brew"
  installer.

0.7.3 August 12 2017

• Build system fixes for Gentoo.

0.7.2 July 26 2017

• Changed font sizes from integer to double to allow fractional font sizes.

0.7.1 July 24 2017

• Fixed issue where internal file creation and modification dates were in the
  local timezone instead of UTC.

0.7.0 June 26 2017

• Added support for CMake build system.

• Fixed issue where image filehandles weren't closed until the overall file
  was closed causing the system to run out of filehandles.