Broaden Checkstyle rule for AssertJ assertion enforcement

See gh-392

Author: izeye

src/checkstyle/checkstyle.xml

@@ -137,7 +137,7 @@
 </module>
 <module name="com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck">
 <property name="maximum" value="0"/>
-<property name="format" value="org\.junit\.Assert\.assert" />
+<property name="format" value="org\.junit\.Assert|org\.junit\.jupiter\.api\.Assertions" />
 <property name="message"
 value="Please use AssertJ imports." />
 <property name="ignoreComments" value="true" />