lintr found issues with code

[github-actions[bot]]

1. vignettes/introduction.Rmd line 68: Variable and function name style should be camelCase. (https://github.com/hugheylab/limorhyde/blob/master/vignettes/introduction.Rmd#L68)

   rhyLimmaSummary[, adj.P.Val := p.adjust(P.Value, method = 'BH')] 

2. vignettes/introduction.Rmd line 86: Variable and function name style should be camelCase. (https://github.com/hugheylab/limorhyde/blob/master/vignettes/introduction.Rmd#L86)

   drLimma[, adj.P.Val := p.adjust(P.Value, method = 'BH')] 

3. vignettes/introduction.Rmd line 104: Variable and function name style should be camelCase. (https://github.com/hugheylab/limorhyde/blob/master/vignettes/introduction.Rmd#L104)

   deLimma[, adj.P.Val := p.adjust(P.Value, method = 'BH')] 

4. vignettes/introduction.Rmd line 116: Put spaces around all infix operators. (https://github.com/hugheylab/limorhyde/blob/master/vignettes/introduction.Rmd#L116)

   labs(x = expression(log[2]*' fold-change'), y = expression(-log[10]*' '*q[DE])) 

5. vignettes/introduction.Rmd line 126: Variable and function name style should be camelCase. (https://github.com/hugheylab/limorhyde/blob/master/vignettes/introduction.Rmd#L126)

   df[, sample_id := colnames(y[geneIdsNow, ])]