small typo in readme

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/integration/solr-4.x/branches/CONNECTORS-914@1583747 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.txt b/README.txt
index 4722a1e..b7cc323 100644
--- a/README.txt
+++ b/README.txt
@@ -49,7 +49,7 @@
 
    The JAR packages can be found in the target folder:
 
-   target/solr3x-plugin-mcf-<VERSION>.jar where <VERSION> is the release version
+   target/solr4x-plugin-mcf-<VERSION>.jar where <VERSION> is the release version
 
 
 Getting Started