Derive UI

[msrd0]

These error messages have poor span:

error[E0277]: the trait bound `influxdb::Timestamp: From<DateTime<Utc>>` is not satisfied
  --> influxdb/tests/derive_integration_tests.rs:16:39
   |
16 | #[cfg_attr(feature = "derive", derive(InfluxDbWriteable))]
   |                                       ^^^^^^^^^^^^^^^^^ the trait `From<DateTime<Utc>>` is not implemented for `influxdb::Timestamp`
   |
   = note: required for `DateTime<Utc>` to implement `Into<influxdb::Timestamp>`
   = note: this error originates in the derive macro `InfluxDbWriteable` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: the trait bound `influxdb::Timestamp: From<DateTime<Utc>>` is not satisfied
  --> influxdb/tests/derive_integration_tests.rs:27:39
   |
27 | #[cfg_attr(feature = "derive", derive(InfluxDbWriteable))]
   |                                       ^^^^^^^^^^^^^^^^^ the trait `From<DateTime<Utc>>` is not implemented for `influxdb::Timestamp`
   |
   = note: required for `DateTime<Utc>` to implement `Into<influxdb::Timestamp>`
   = note: this error originates in the derive macro `InfluxDbWriteable` (in Nightly builds, run with -Z macro-backtrace for more info)