Rollback servlet-api dependencies until next release

git-svn-id: https://svn.apache.org/repos/asf/turbine/fulcrum/trunk/parser@1843286 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index ed5d5a4..73b0f22 100644
--- a/pom.xml
+++ b/pom.xml
@@ -81,7 +81,7 @@
     <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>javax.servlet-api</artifactId>
-      <version>4.0.1</version>
+      <version>3.1.0</version>
       <scope>provided</scope>
       <optional>true</optional>
     </dependency>