Fix BDD import restrictions

Closes gh-220

Author: philwebb

spring-javaformat/spring-javaformat-checkstyle/src/main/resources/io/spring/javaformat/checkstyle/spring-checkstyle.xml

@@ -125,9 +125,9 @@
 		</module>
  		<module name="com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck">
  			<property name="maximum" value="0"/>
-			<property name="format" value="org\.mockito\.Mockito\.(when|doThrow|doAnswer)" />
+			<property name="format" value="org\.mockito\.(Mockito|BDDMockito)\.(when|doThrow|doAnswer)" />
 			<property name="message"
-				value="Please use BDDMockito imports." />
+				value="Please use BDD-style (given, when, then) using BDDMockito imports." />
 			<property name="ignoreComments" value="true" />
 		</module>
  		<module name="com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck">