message: Simplified visit_generics
  Realised with new way I can just ignore entire WhereClause span
diff: @@ -416,12 +416,7 @@ fn visit_impl(impl_blk: &ItemImpl, analysis: &mut LineAnalysis, ctx: &Context) {
  fn visit_generics(generics: &Generics, analysis: &mut LineAnalysis) {
  if let Some(ref wh) = generics.where_clause {
  - let span = wh.where_token.0;
  - let mut lines: Vec<usize> = Vec::new();
  - for l in span.start().line..span.end().line +1 {
  - lines.push(l);
  - }
  - analysis.add_to_ignore(&lines);
  + analysis.ignore_span(&wh.span());
  }
  }
  