Returns `true` if this timestamp has a range ```rust use orgize::{Org, ast::Timestamp}; let ts = Org::parse("[2003-09-16 Tue 09:39-10:39]").first_node:: ().unwrap(); assert!(ts.is_range()); let ts = Org::parse("[2003-09-16 Tue 09:39]--[2003-09-16 Tue 10:39]").first_node:: ().unwrap(); assert!(ts.is_range()); let ts = Org::parse("[2003-09-16]--[2003-09-16]").first_node::<Times
(&self)
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