Fixes: PHP Fatal error: UnusedVariableSniff (#3)

* Fixes: PHP Fatal error:  Uncaught TypeError: Return value of SlevomatCodingStandard\Sniffs\Variables\UnusedVariableSniff

* composer update

Author: defunctl

composer.lock

@@ -116,7 +116,7 @@
     <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
         <properties>
             <property name="spacesCountAroundEqualsSign" value="0"/>
-            <property name="declareOnFirstLine" value="1"/>
+            <property name="declareOnFirstLine" value="true"/>
             <property name="linesCountAfterDeclare" value="1"/>
         </properties>
     </rule>
@@ -129,12 +129,12 @@
     </rule>
     <rule ref="SlevomatCodingStandard.Classes.ClassConstantVisibility">
         <properties>
-            <property name="fixable" value="1"/>
+            <property name="fixable" value="true"/>
         </properties>
     </rule>
     <rule ref="SlevomatCodingStandard.Namespaces.UnusedUses">
         <properties>
-            <property name="searchAnnotations" value="1"/>
+            <property name="searchAnnotations" value="true"/>
         </properties>
     </rule>
     <!-- Checks for missing return typehints in case they can be declared natively -->
@@ -234,7 +234,7 @@
     <rule ref="SlevomatCodingStandard.Variables.DuplicateAssignmentToVariable"/>
     <rule ref="SlevomatCodingStandard.Variables.UnusedVariable">
         <properties>
-            <property name="ignoreUnusedValuesWhenOnlyKeysAreUsedInForeach" value="1"/>
+            <property name="ignoreUnusedValuesWhenOnlyKeysAreUsedInForeach" value="true"/>
         </properties>
     </rule>
     <rule ref="SlevomatCodingStandard.Variables.UselessVariable"/>