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README.md

@@ -11,6 +11,8 @@ Rust port of [TrueSkillThroughTime.py](https://github.com/glandfried/TrueSkillTh
 
 ## Todo
 
-- [ ] Change time from u64 to i64 so we can use i64::MIN in `batch::compute_elapsed()`
+- [x] Implement approx for Gaussian
+- [ ] Add more tests from `TrueSkillThroughTime.jl`
+- [ ] Time needs to be an enum so we can have multiple states (see `batch::compute_elapsed()`)
 - [ ] Add examples (use same TrueSkillThroughTime.(py|jl))
 - [ ] Add Observer (see [argmin](https://docs.rs/argmin/latest/argmin/core/trait.Observe.html) for inspiration)