ibus-table requires Python3 now, require it here as well
Updates and bugfixes for the LaTeX table by Giuseppe Castagna (original author of the LaTeX table)
Add _ and ^ to the start characters for the LaTeX table

The newest update by Giuseppe Castagna for his LaTeX table uses

    ### Subscript - superscript
    ###
    _1	₁	0
    ...
    ^0	⁰	0

Therefore, _ and ^ need to be start characters as well.
Release 1.3.1