report() not outputting denominator degrees of freedom

For example, the following code...

```r
m<- lmerTest::lmer(mpg ~ wt+ (1| gear), data=mtcars) 
report(anova(m)) 
``` 

... provides a written summary that is missing the denominator degrees of freedom:

" The ANOVA suggests that:The main effect of wt is statistically significant and large (F(1) = 62.20, p < .001; Eta2 (partial) = 0.74, 95% CI [0.56, 1.00]) "

