Relax syntax a bit

Author: andrewdalpino

src/CrossValidation/Metrics/Completeness.php

@@ -60,7 +60,7 @@ public function compatibility() : array
      */
     public function score(array $predictions, array $labels) : float
     {
-        $table = new ContingencyTable()->generate($labels, $predictions);
+        $table = (new ContingencyTable())->generate($labels, $predictions);
 
         $score = 0.0;
 

src/CrossValidation/Metrics/Homogeneity.php

@@ -61,7 +61,7 @@ public function compatibility() : array
      */
     public function score(array $predictions, array $labels) : float
     {
-        $table = new ContingencyTable()->generate($predictions, $labels);
+        $table = (new ContingencyTable())->generate($predictions, $labels);
 
         $score = 0.0;
 

src/CrossValidation/Metrics/RandIndex.php

@@ -72,7 +72,7 @@ public function compatibility() : array
      */
     public function score(array $predictions, array $labels) : float
     {
-        $table = new ContingencyTable()->generate($labels, $predictions);
+        $table = (new ContingencyTable())->generate($labels, $predictions);
 
         $table = Matrix::build($table->toArray());
 

src/CrossValidation/Metrics/VMeasure.php

@@ -79,8 +79,8 @@ public function compatibility() : array
      */
     public function score(array $predictions, array $labels) : float
     {
-        $homogeneity = new Homogeneity()->score($predictions, $labels);
-        $completeness = new Completeness()->score($predictions, $labels);
+        $homogeneity = (new Homogeneity())->score($predictions, $labels);
+        $completeness = (new Completeness())->score($predictions, $labels);
 
         return (1.0 + $this->beta) * $homogeneity * $completeness
             / (($this->beta * $homogeneity + $completeness) ?: EPSILON);