add Final Prediction Error (FPE)

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7fa112e) 87.35% compared to head (a21403f) 87.92%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #144 +/- ## ========================================== + Coverage 87.35% 87.92% +0.56% ========================================== Files 13 13 Lines 2318 2327 +9 ========================================== + Hits 2025 2046 +21 + Misses 293 281 -12 ``` | [Flag](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson) | `87.92% <91.66%> (+0.56%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson) | Coverage Δ | | |---|---|---| | [ext/ControlSystemIdentificationLSOptExt.jl](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#diff-ZXh0L0NvbnRyb2xTeXN0ZW1JZGVudGlmaWNhdGlvbkxTT3B0RXh0Lmps) | `98.38% <ø> (ø)` | | | [src/utils.jl](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#diff-c3JjL3V0aWxzLmps) | `88.33% <100.00%> (+25.58%)` | :arrow_up: | | [src/plotting.jl](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#diff-c3JjL3Bsb3R0aW5nLmps) | `92.52% <66.66%> (ø)` | |

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