docs: add some comments about future potential changes

Signed-off-by: Christina Sørensen <ces@fem.gg>

src/main.rs

@@ -10,6 +10,7 @@ use utils::print_time_delta;
 
 use crate::utils::parse_timestamp;
 
+// TODO: this struct shouldn't be nescesarry
 #[derive(Debug)]
 struct SharedState {
     now: DateTime<Local>,

src/utils.rs

@@ -15,6 +15,7 @@ pub fn naive_time_to_local_datetime(ctx: &SharedState, t: NaiveTime) -> DateTime
 pub fn parse_timestamp(ctx: &SharedState, input: &String) -> DateTime<Local> {
     let tz = ctx.tz;
 
+    // TODO: should be a match case
     if let Some(t) = input.parse::<DateTime<Local>>().ok() {
         t
     } else if let Some(t) = NaiveDateTime::parse_from_str(input, "%Y-%m-%d %H:%M:%S").ok() {