I want to remove the blank line between 'years' and 'months' in a pgfgantt chart.
What's the easiest way to do this?
This MWE shows the blank line that I want to remove:
\documentclass[tikz]{standalone}
\usepackage{pgfgantt}
\begin{document}
\begin{ganttchart}[
time slot format=isodate-yearmonth,
time slot unit=month
]{2019-01}{2020-09}
\gantttitlecalendar{year, month=letter} \\
\ganttgroup[]{foo}{2019-07}{2020-03} \\
\ganttgroup[]{bar}{2020-01}{2020-07} \\
\end{ganttchart}
\end{document}
