* test(tsi): cover periods/value accessors + name metadata
Codecov flagged 9 lines in indicators/tsi.rs (file at 92.30%): const
accessors periods (70-72), value (75-77) and Indicator-impl name
(137-139). tsi.rs now at 117/117.
* test(ultimate_oscillator): cover periods/value accessors + name metadata
Codecov flagged 9 lines in indicators/ultimate_oscillator.rs
(file at 94.76%): const accessors periods (96-98), value (101-103)
and Indicator-impl name (193-195). uo.rs now at 172/172.
* test(vortex): cover period/value accessors + name metadata
Codecov flagged 9 lines in indicators/vortex.rs (file at 93.18%): const
accessors period (84-86), value (89-91) and Indicator-impl name
(157-159). vortex.rs now at 132/132.
* test(vwma): cover period/value accessors + name metadata
Codecov flagged 9 lines in indicators/vwma.rs (file at 92.56%): const
accessors period (72-74), value (77-79) and Indicator-impl name
(129-131). vwma.rs now at 121/121.
* test(zlema): cover period/value accessors + name metadata
Codecov flagged 9 lines in indicators/zlema.rs (file at 90.62%): const
accessors period (62-64), value (72-74) and Indicator-impl name
(111-113). zlema.rs now at 96/96.