update plexus (#43)

diff --git a/pom.xml b/pom.xml
index 4f0d7f1..41a3e42 100644
--- a/pom.xml
+++ b/pom.xml
@@ -163,7 +163,7 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-interactivity-api</artifactId>
-        <version>1.0-alpha-6</version>
+        <version>1.0</version>
          <exclusions>
           <exclusion>
             <groupId>org.codehaus.plexus</groupId>
@@ -174,7 +174,7 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-velocity</artifactId>
-        <version>1.1.8</version>
+        <version>1.2</version>
         <exclusions>
           <exclusion>
             <groupId>velocity</groupId>