0.8.11 (16.04.2019)

UPDATE IS REQUIRED. fixes for R>=3.6 and data.table >=1.12.2.
now htmlTable respects 'align' argument (Issue #20)
fix 'add_labelled_class' for 'haven' 2.0
improve SPSS syntax in 'write_labelled_spss'
add new significance test - 'significance_cell_chisq'/'tab_last_sig_cell_chisq'. Idea by Roberto Gilsaura.
now 'significance_cases' has new argument 'correct' for Yates' correction. By default it is TRUE
add 'qe' function for making list of expressions
..$ selector now supports arbitrary expression
fix bug in 'cro_mean_sd_n with incorrect weighted valid n in some cases
Numerous small bugfixes

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