Update README.md

tables/README.md

@@ -3,7 +3,7 @@ This directory contains the methods from the paper
 in various tables. 
 We give both representations, as a succession of Euler-like steps
 as well as a succession by Strang-like steps performed by 
-the transformation rule by [McLachlan1995]
+the transformation rule by [McLachlan1995].
 
 ## Files
 - coeff_table.nb : Mathematica-12 notebook. Useful for obtaining the most digits.