Fixed missing import

(cherry picked from commit 0724e3a7)

src/test/java/cz/muni/fi/pb162/project/geometry/Vertex2DTest.java

@@ -3,6 +3,7 @@ package cz.muni.fi.pb162.project.geometry;
 import cz.muni.fi.pb162.project.helper.BasicRulesTester;
 import org.junit.Before;
 import org.junit.Test;
+import java.util.regex.Pattern;
 
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.AssertionsForClassTypes.assertThat;