Update README.md

according to #81, add tips for package dependency issue.

README.md

@@ -149,5 +149,19 @@ Example file below. Note that you can name every mapping the way you want - it's
 # A Sample
 Check out this [sample project](https://github.com/kongchen/swagger-maven-example) to see how this happens.
 
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-
+# Dependency conflict
+If you have package depedency conflict issues, such as jackson, joda-time, or [jsr311-api](https://github.com/kongchen/swagger-maven-plugin/issues/81). Run `mvn dependency:tree` to check which package introduces the one conflicts with yours and exclude it using `<exclusion/>` in pom.xml.
+> e.g. exclude `javax.ws.rs:jsr311-api:jar:1.1.1:compile` from `swagger-jaxrs_2.10`:
+```xml
+    <dependency>
+        <groupId>com.wordnik</groupId>
+        <artifactId>swagger-jaxrs_2.10</artifactId>
+        <version>1.3.2</version>
+        <exclusions>
+            <exclusion>
+                <groupId>javax.ws.rs</groupId>
+                <artifactId>jsr311-api</artifactId>
+            </exclusion>
+        </exclusions>
+    </dependency>   
+```