:octocat: fix PHPCS config, add Slevomat rules

src/Common/GenericGFPoly.php

@@ -31,7 +31,6 @@ final class GenericGFPoly{
 	/**
 	 * @param int[]      $coefficients array coefficients as ints representing elements of GF(size), arranged
 	 *                                 from most significant (highest-power term) coefficient to the least significant
-	 * @param int|null   $degree
 	 *
 	 * @throws \chillerlan\QRCode\QRCodeException if argument is null or empty, or if leading coefficient is 0 and this
 	 *                                            is not a constant polynomial (that is, it is not the monomial "0")
@@ -116,9 +115,6 @@ final class GenericGFPoly{
 		return $result;
 	}
 
-	/**
-	 *
-	 */
 	public function multiply(GenericGFPoly $other):self{
 
 		if($this->isZero() || $other->isZero()){
@@ -163,9 +159,6 @@ final class GenericGFPoly{
 
 	}
 
-	/**
-	 *
-	 */
 	public function multiplyInt(int $scalar):self{
 
 		if($scalar === 0){
@@ -207,9 +200,6 @@ final class GenericGFPoly{
 		return new self($product);
 	}
 
-	/**
-	 *
-	 */
 	public function mod(GenericGFPoly $other):self{
 
 		if((count($this->coefficients) - count($other->coefficients)) < 0){
@@ -225,9 +215,6 @@ final class GenericGFPoly{
 		return (new self($this->coefficients))->mod($other);
 	}
 
-	/**
-	 *
-	 */
 	public function addOrSubtract(GenericGFPoly $other):self{
 
 		if($this->isZero()){