Fix clippy warnings.

src/model/binary.rs

@@ -28,7 +28,7 @@ pub struct BinaryModel {
 impl BinaryModel {
     pub fn new(win_obs: BinaryModelObservation) -> Self {
         BinaryModel {
-            storage: Storage::new(),
+            storage: Storage::default(),
             last_t: f64::NEG_INFINITY,
             win_obs,
             observations: Vec::new(),

src/model/difference.rs

@@ -23,7 +23,7 @@ pub struct DifferenceModel {
 impl DifferenceModel {
     pub fn new(var: f64) -> Self {
         DifferenceModel {
-            storage: Storage::new(),
+            storage: Storage::default(),
             last_t: f64::NEG_INFINITY,
             observations: Vec::new(),
             _last_method: None,

src/model/ternary.rs

@@ -30,7 +30,7 @@ pub struct TernaryModel {
 impl TernaryModel {
     pub fn new(obs: TernaryModelObservation, margin: f64) -> Self {
         TernaryModel {
-            storage: Storage::new(),
+            storage: Storage::default(),
             last_t: f64::NEG_INFINITY,
             obs, // default = probit
             observations: Vec::new(),